Company lists · Data refreshed November 2026
Top 25 Diamond grading laboratories based in the United States
RevenueBase identified 282 company matches for diamond grading laboratories associated with the United States as of November 2026 and tracks 2,764 professional contacts across them, including 656 with verified work emails. New York is the largest hub.
This list covers company matches for diamond grading laboratories associated with the United States, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed November 6, 2026.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.
The 25 largest diamond grading laboratories based in the United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 385 contacts → | ||||
Exact match “IGI, a Blackstone portfolio company, is the world’s largest independent provider of gemological services.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 2 | 284 contacts → | ||||
Exact match “Founded in 1996 with a mission to delight customers with exceptional products and superior service, Kama Jewelry has firmly established itself among the top ten diamond jewelry…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 3 | 194 contacts → | ||||
Exact match “Founded in 2016 by a former BCG consultant frustrated with his own engagement ring buying experience, Rare Carat began with a mission to make diamond buying more transparent for…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 4 | 121 contacts → | ||||
Exact match “Founded by Keith Leclerc in 1981, International Diamond Center began as a jewelry wholesaler.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 5 | 65 contacts → | ||||
Exact match “Maitri Diamonds manufactures the perfectly sustainable alternative to naturally sourced mined diamonds – Lab-grown Diamonds.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 6 | 50 contacts → | ||||
Exact match “America's Diamond Specialist - Memo and Stock Quality, attention to detail, honesty, fairness, and on-time delivery.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 7 | 46 contacts → | ||||
Exact match “We partner with you.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 8 | 36 contacts → | ||||
Exact match “Ascot Diamonds is a jewelry store with locations in Atlanta, Washington DC, Dallas, New York, Charlotte, Charleston SC, and Philadelphia.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 9 | 35 contacts → | ||||
Exact match “50 Years of Diamonds.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 10 | 32 contacts → | ||||
Exact match “Beny Sofer, Inc.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 11 | 32 contacts → | ||||
Exact match “Leviev Diamonds has been a trusted source of exceptional natural diamonds for polishers, cutters, and jewelers for over three decades.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 12 | 31 contacts → | ||||
Exact match Recorded description not available. Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 13 | 31 contacts → | ||||
Exact match “he 'Sanghavi Exports Group' was founded by the four Sanghavi brothers, Vasant, Kirti, Ramesh and Chandrakant in the late 70s, with a great vision of achieving major success &…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 14 | 30 contacts → | ||||
Exact match “Discover how Labrilliante can elevate your business, visit labrilliante.com Who We Are Labrilliante is the trusted B2B supplier of lab-grown diamonds, serving over jewelry…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 15 | 29 contacts → | ||||
Exact match “Established in 1985, SFD is a family-owned and operated business.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 16 | 27 contacts → | ||||
Exact match “Saban Diamonds (founded in 1977) and Onyx Diamonds (founded in 1987) made a name for themselves separately as pioneers in the manufacture of square and rectangular diamonds.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 17 | 21 contacts → | ||||
Exact match “Clean Origin is a 3rd generation diamond jewelry business, focusing exclusively on ethically sourced, lab grown diamonds.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 18 | 20 contacts → | ||||
Exact match “Now celebrating 75 years, for three generations, Grandview Klein has been renowned for its diamond cutting expertise and devotion to its clients.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 19 | 20 contacts → | ||||
Exact match “For over four decades, Yerushalmi Bros.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 20 | 20 contacts → | ||||
Exact match “At Dev Jewels, we redefine luxury with our exquisite lab-grown diamond jewelry.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 21 | 19 contacts → | ||||
Exact match “At Jean Dousset, we have a bold vision of a more liberated future.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 22 | 18 contacts → | ||||
Exact match “The Jewelry Exchange is the nation’s best online resource for high quality loose diamonds, EGL Diamond, Gia Diamonds, engagement ring and diamond jewelry at the lowest prices.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 23 | 18 contacts → | ||||
Exact match “We perfected a stone that is better than a mined diamond: The Contemporary Nexus Diamond™.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 24 | 18 contacts → | ||||
Exact match “ALTR Created Diamonds are shaping the future of the lab-grown diamond industry.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 25 | 17 contacts → | ||||
Exact match “The world’s finest lab created diamond rough crystal is just half the story.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
RevenueBase SmartSearch
Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.
This list uses Exact for “diamond grading laboratories”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.
Showing 25 of 282 diamond grading laboratories based in the United States
See the full list, filter by size, metro and specialty, and access 656 tracked professional contacts with verified work emails. Direct dials are available where recorded.
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Diamond grading laboratories based in the United States at a glance
As of Nov 6, 2026Companies by employee count
Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 282 companies.
How this list was built
The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
- What qualifies
- Company records associated with the United States whose business descriptions match “diamond grading laboratories” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
- RevenueBase SmartSearch
- Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
- Public preview
- The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
- Match quality
- RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
- Ranking
- Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
- Verification
- Every displayed company carries at least one verified work email. RevenueBase tracks 656 professional contacts with verified work emails across the full matched dataset. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
- Refresh
- This page's figures were pulled from the company graph on November 6, 2026. Lists refresh periodically as the graph is re-checked.
- Record context
- Company records and descriptions can change. Check the company's website for its current services and locations.
Diamond grading laboratories by metro
Frequently asked
What is RevenueBase SmartSearch?
RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “diamond grading laboratories”; each Exact match badge shows search membership, not an individual similarity or quality score.
How many diamond grading laboratories are there based in the United States?
RevenueBase identified 282 company matches for diamond grading laboratories associated with the United States as of November 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.
What is the largest company on this list?
International Gemological Institute - USA tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.
Which city has the most diamond grading laboratories?
New York leads with 124 company records, followed by Los Angeles (18) and Chicago (8).
How do I get contact information for these companies?
A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 656 professional contacts with verified work emails tracked across these 282 companies; direct dials are available where recorded.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on November 6, 2026.
Ready to reach these companies? Verified emails and direct dials for all 282 diamond grading laboratories based in the United States. Start with a free account, no credit card.
Download this list →Related lists
Diamond grading laboratories by geography
- Diamond grading laboratories based in Antwerp, Belgium
- Diamond grading laboratories based in Mumbai, India
- Diamond grading laboratories based in Surat, India
- Diamond grading laboratories based in New York, United States
- Diamond grading laboratories based in Australia
- Diamond grading laboratories based in Belgium
- Diamond grading laboratories based in Hong Kong
- Diamond grading laboratories based in India
About this data
RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase SmartSearch, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.
More company lists
- All company lists
- Lists by location
- Lists A-Z
- New lists
- Diamond grading laboratories based in Antwerp, Belgium
- Diamond grading laboratories based in Mumbai, India
- Diamond grading laboratories based in Surat, India
- Diamond grading laboratories based in New York, United States
- Diamond grading laboratories based in Australia
- Diamond grading laboratories based in Belgium
Company intelligence · public preview
Top 25 diamond grading laboratories based in the United States
Find companies in any niche.
Describe the businesses you want in your own words. RevenueBase SmartSearch matches company descriptions by meaning.
RevenueBase records 282 matching company records for diamond grading laboratories based in the United States, with 2,764 tracked contacts and 656 verified work emails.
This public preview shows 25 selected records ordered by tracked contacts. RevenueBase SmartSearch finds company descriptions that match by meaning at Exact. Snapshot: November 6, 2026.
RevenueBase compiles business descriptions for niche-company discovery; each row shows a recorded excerpt where available. Adapt this search to find the companies and contacts you want.
Top 25 diamond grading laboratories based in the United States
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
| # | Company | Headquarters on record | Reported employees | RevenueBase SmartSearch | Tracked contacts |
|---|---|---|---|---|---|
| 1 | HQ: New York, CA, United StatesReported employees: 501-1,000 | New York, CA, United States | 501-1,000 | Exact match | 385 contacts → |
“IGI, a Blackstone portfolio company, is the world’s largest independent provider of gemological services.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 2 |  Kama Jewelrykamajewelry.comHQ: New York, NY, United StatesReported employees: 1,001-5,000 | New York, NY, United States | 1,001-5,000 | Exact match | 284 contacts → |
“Founded in 1996 with a mission to delight customers with exceptional products and superior service, Kama Jewelry has firmly established itself among the top ten diamond jewelry…” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 3 |  Rare Caratrarecarat.comHQ: New York, NY, United StatesReported employees: 51-200 | New York, NY, United States | 51-200 | Exact match | 194 contacts → |
“Founded in 2016 by a former BCG consultant frustrated with his own engagement ring buying experience, Rare Carat began with a mission to make diamond buying more transparent for…” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 4 |  International Diamond Centershopidc.comHQ: Clearwater, FL, United StatesReported employees: 51-200 | Clearwater, FL, United States | 51-200 | Exact match | 121 contacts → |
“Founded by Keith Leclerc in 1981, International Diamond Center began as a jewelry wholesaler.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 5 |  Maitri Diamonds INCmaitri.nycHQ: New York, NY, United StatesReported employees: 1,001-5,000 | New York, NY, United States | 1,001-5,000 | Exact match | 65 contacts → |
“Maitri Diamonds manufactures the perfectly sustainable alternative to naturally sourced mined diamonds – Lab-grown Diamonds.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 6 |  RDI Diamonds INCrdidiamonds.comHQ: Rochester, NY, United StatesReported employees: 51-200 | Rochester, NY, United States | 51-200 | Exact match | 50 contacts → |
“America's Diamond Specialist - Memo and Stock Quality, attention to detail, honesty, fairness, and on-time delivery.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 7 |  Ofer Mizrahi Diamondsom-diamonds.comHQ: Chicago, IL, United StatesReported employees: 51-200 | Chicago, IL, United States | 51-200 | Exact match | 46 contacts → |
“We partner with you.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 8 |  Ascot Diamondsascotdiamonds.comHQ: Atlanta, NY, United StatesReported employees: 11-50 | Atlanta, NY, United States | 11-50 | Exact match | 36 contacts → |
“Ascot Diamonds is a jewelry store with locations in Atlanta, Washington DC, Dallas, New York, Charlotte, Charleston SC, and Philadelphia.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 9 |  Amipi INCamipi.comHQ: New York, United StatesReported employees: 11-50 | New York, United States | 11-50 | Exact match | 35 contacts → |
“50 Years of Diamonds.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 10 |  Beny Sofer INCbenysofer.comHQ: New York, NY, United StatesReported employees: 11-50 | New York, NY, United States | 11-50 | Exact match | 32 contacts → |
“Beny Sofer, Inc.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 11 |  Leviev Diamondsleviev.comHQ: New York, NY, United StatesReported employees: 11-50 | New York, NY, United States | 11-50 | Exact match | 32 contacts → |
“Leviev Diamonds has been a trusted source of exceptional natural diamonds for polishers, cutters, and jewelers for over three decades.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 12 |  Cygni LAB Diamondscygnilab.comHQ: New York, NY, United StatesReported employees: 501-1,000 | New York, NY, United States | 501-1,000 | Exact match | 31 contacts → |
No recorded description excerpt is available for this public record. | |||||
| 13 | Sanghavi Diamonds INCsanghavidiamonds.com HQ: New York, NY, United StatesReported employees: Not recorded | New York, NY, United States | Not recorded | Exact match | 31 contacts → |
“he 'Sanghavi Exports Group' was founded by the four Sanghavi brothers, Vasant, Kirti, Ramesh and Chandrakant in the late 70s, with a great vision of achieving major success &…” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 14 |  Labrilliante LLClabrilliante.comHQ: Hoboken, NJ, United StatesReported employees: 11-50 | Hoboken, NJ, United States | 11-50 | Exact match | 30 contacts → |
“Discover how Labrilliante can elevate your business, visit labrilliante.com Who We Are Labrilliante is the trusted B2B supplier of lab-grown diamonds, serving over jewelry…” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 15 |  SFD Trading INCviaraz.comHQ: San Francisco, CA, United StatesReported employees: 1-10 | San Francisco, CA, United States | 1-10 | Exact match | 29 contacts → |
“Established in 1985, SFD is a family-owned and operated business.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 16 |  Saban Onyx INCsabanonyx.comHQ: New York, NY, United StatesReported employees: 51-200 | New York, NY, United States | 51-200 | Exact match | 27 contacts → |
“Saban Diamonds (founded in 1977) and Onyx Diamonds (founded in 1987) made a name for themselves separately as pioneers in the manufacture of square and rectangular diamonds.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 17 |  Clean Origincleanorigin.comHQ: Frisco, TX, United StatesReported employees: 11-50 | Frisco, TX, United States | 11-50 | Exact match | 21 contacts → |
“Clean Origin is a 3rd generation diamond jewelry business, focusing exclusively on ethically sourced, lab grown diamonds.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 18 |  Grandview Klein Diamond Groupgkdg.comHQ: New York, NY, United StatesReported employees: 11-50 | New York, NY, United States | 11-50 | Exact match | 20 contacts → |
“Now celebrating 75 years, for three generations, Grandview Klein has been renowned for its diamond cutting expertise and devotion to its clients.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 19 |  Yerushalmi Bros. Diamonds LTDyerushalmi.comHQ: Los Angeles, CA, United StatesReported employees: 11-50 | Los Angeles, CA, United States | 11-50 | Exact match | 20 contacts → |
“For over four decades, Yerushalmi Bros.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 20 |  DEV Jewelsdevjewels.comHQ: New York, NY, United StatesReported employees: 51-200 | New York, NY, United States | 51-200 | Exact match | 20 contacts → |
“At Dev Jewels, we redefine luxury with our exquisite lab-grown diamond jewelry.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 21 |  Jean Doussetjeandousset.comHQ: Los Angeles, CA, United StatesReported employees: 11-50 | Los Angeles, CA, United States | 11-50 | Exact match | 19 contacts → |
“At Jean Dousset, we have a bold vision of a more liberated future.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 22 |  Goldenwest Diamond Corporationjewelryexchange.comHQ: Tustin, CA, United StatesReported employees: 201-500 | Tustin, CA, United States | 201-500 | Exact match | 18 contacts → |
“The Jewelry Exchange is the nation’s best online resource for high quality loose diamonds, EGL Diamond, Gia Diamonds, engagement ring and diamond jewelry at the lowest prices.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 23 |  Diamond Nexusdiamondnexus.comHQ: Franklin, WI, United StatesReported employees: 51-200 | Franklin, WI, United States | 51-200 | Exact match | 18 contacts → |
“We perfected a stone that is better than a mined diamond: The Contemporary Nexus Diamond™.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 24 |  Altr Created Diamondsaltr.nycHQ: New York, NY, United StatesReported employees: 11-50 | New York, NY, United States | 11-50 | Exact match | 18 contacts → |
“ALTR Created Diamonds are shaping the future of the lab-grown diamond industry.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 25 |  Green Rocks Diamondsgreenrocksdiamonds.comHQ: Aventura, FL, United StatesReported employees: 11-50 | Aventura, FL, United States | 11-50 | Exact match | 17 contacts → |
“The world’s finest lab created diamond rough crystal is just half the story.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
Showing 25 of 282 company matches
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Diamond grading laboratories: dataset insights
November 6, 2026These summaries describe recorded coverage in this saved dataset. This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Reported company sizes
280 records in the displayed employee bands.
2 matching records are outside the displayed bands or do not have a displayed size. Bars show shares of the displayed bands.
Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 282 companies.
How this company list was built
Describe a niche in your own words: companies installing commercial solar, or manufacturers of sustainable packaging. RevenueBase SmartSearch finds companies whose compiled business descriptions match by meaning. This list is one saved example to adapt.
Where the company descriptions come from
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
RevenueBase SmartSearch matching settings
- Exact
- Closest fits to the business described.
- Similar
- Similar businesses with a wider range of fits.
- Related
- Related businesses in and around the category.
- Broad
- A broader set of businesses connected to the description.
RevenueBase SmartSearch · Exact match identifies inclusion in this search's closest semantic matching setting. It is not a per-company confidence score, a literal keyword match, or a quality endorsement.
Selection, ordering and scope
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Recorded company descriptions support research; check company websites for current services. The selected preview is ordered by tracked contacts and is not a list of the best service providers.
Snapshot: November 6, 2026.
RevenueBase is a B2B data infrastructure company. Its September 3, 2026 published methodology describes a graph of 60 million companies and 398.9 million professional contacts; these platform figures differ from this page's totals. Published methodology ↗
Diamond grading laboratories by metro
Questions about this company list
What does Exact match mean for diamond grading laboratories?
The separate RevenueBase SmartSearch column identifies inclusion at the closest semantic matching preset. It is not a literal keyword match, a per-company confidence score or a quality endorsement. Changing the search form opens a new search in RevenueBase; it does not reclassify these saved rows.
How many diamond grading laboratories did RevenueBase find based in the United States?
The saved snapshot records 282 matching company records, 2,764 tracked contacts and 656 verified emails. The public preview displays 25 selected records.
Where do the company descriptions come from?
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
How are the public companies ordered?
The selected public records are ordered by contacts tracked in RevenueBase, highest first. Contact coverage is a prospecting measure, not an assessment of the company's services or quality.
How can I get contact information?
Select a company's contact count to open its filtered contacts in RevenueBase. Free signup is required and includes 500 credits and limited free results. Verified emails, direct dials and mobile numbers depend on available coverage.
How current is this list?
Snapshot: November 6, 2026. Review each company's website for current services and locations. A recorded business description does not establish that every company offers every service named in the search.
What do headquarters and employee bands mean?
These are recorded company-level fields, rather than a map of every branch or a count of specialists. Missing headquarters or employee bands are labeled; older records may show a location separately from recorded headquarters.
Build your next target company list
Adapt this niche search and work with available contacts in RevenueBase.
Related lists
Diamond grading laboratories by geography
- Diamond grading laboratories based in Antwerp, Belgium
- Diamond grading laboratories based in Mumbai, India
- Diamond grading laboratories based in Surat, India
- Diamond grading laboratories based in New York, United States
- Diamond grading laboratories based in Australia
- Diamond grading laboratories based in Belgium
- Diamond grading laboratories based in Hong Kong
- Diamond grading laboratories based in India
Cite this list
RevenueBase Data Team. Top 25 diamond grading laboratories based in the United States. Snapshot: November 6, 2026. https://revenuebase.ai/companies/diamond-grading-laboratories/united-states.
This is a selected public preview of saved company records, rather than an independently verified census. Open the source page ↗
More company lists
- All company lists
- Lists by location
- Lists A-Z
- New lists
- Diamond grading laboratories based in Antwerp, Belgium
- Diamond grading laboratories based in Mumbai, India
- Diamond grading laboratories based in Surat, India
- Diamond grading laboratories based in New York, United States
- Diamond grading laboratories based in Australia
- Diamond grading laboratories based in Belgium
Company intelligence · public preview
Top 25 diamond grading laboratories based in the United States
RevenueBase records 282 matching company records for diamond grading laboratories based in the United States, with 2,764 tracked contacts and 656 verified work emails.
This public preview shows 25 selected records ordered by tracked contacts. RevenueBase SmartSearch finds company descriptions that match by meaning at Exact. Snapshot: November 6, 2026.
RevenueBase compiles business descriptions for niche-company discovery; each row shows a recorded excerpt where available. Adapt this search to find the companies and contacts you want.
Top 25 diamond grading laboratories based in the United States
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
| # | Company | Headquarters on record | Reported employees | RevenueBase SmartSearch | Tracked contacts |
|---|---|---|---|---|---|
| 1 | HQ: New York, CA, United StatesReported employees: 501-1,000 | New York, CA, United States | 501-1,000 | Exact match | 385 contacts → |
“IGI, a Blackstone portfolio company, is the world’s largest independent provider of gemological services.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 2 | Kama Jewelrykamajewelry.com HQ: New York, NY, United StatesReported employees: 1,001-5,000 | New York, NY, United States | 1,001-5,000 | Exact match | 284 contacts → |
“Founded in 1996 with a mission to delight customers with exceptional products and superior service, Kama Jewelry has firmly established itself among the top ten diamond jewelry…” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 3 | Rare Caratrarecarat.com HQ: New York, NY, United StatesReported employees: 51-200 | New York, NY, United States | 51-200 | Exact match | 194 contacts → |
“Founded in 2016 by a former BCG consultant frustrated with his own engagement ring buying experience, Rare Carat began with a mission to make diamond buying more transparent for…” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 4 | International Diamond Centershopidc.com HQ: Clearwater, FL, United StatesReported employees: 51-200 | Clearwater, FL, United States | 51-200 | Exact match | 121 contacts → |
“Founded by Keith Leclerc in 1981, International Diamond Center began as a jewelry wholesaler.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 5 | Maitri Diamonds INCmaitri.nyc HQ: New York, NY, United StatesReported employees: 1,001-5,000 | New York, NY, United States | 1,001-5,000 | Exact match | 65 contacts → |
“Maitri Diamonds manufactures the perfectly sustainable alternative to naturally sourced mined diamonds – Lab-grown Diamonds.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 6 | RDI Diamonds INCrdidiamonds.com HQ: Rochester, NY, United StatesReported employees: 51-200 | Rochester, NY, United States | 51-200 | Exact match | 50 contacts → |
“America's Diamond Specialist - Memo and Stock Quality, attention to detail, honesty, fairness, and on-time delivery.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 7 | Ofer Mizrahi Diamondsom-diamonds.com HQ: Chicago, IL, United StatesReported employees: 51-200 | Chicago, IL, United States | 51-200 | Exact match | 46 contacts → |
“We partner with you.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 8 | Ascot Diamondsascotdiamonds.com HQ: Atlanta, NY, United StatesReported employees: 11-50 | Atlanta, NY, United States | 11-50 | Exact match | 36 contacts → |
“Ascot Diamonds is a jewelry store with locations in Atlanta, Washington DC, Dallas, New York, Charlotte, Charleston SC, and Philadelphia.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 9 | Amipi INCamipi.com HQ: New York, United StatesReported employees: 11-50 | New York, United States | 11-50 | Exact match | 35 contacts → |
“50 Years of Diamonds.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 10 | Beny Sofer INCbenysofer.com HQ: New York, NY, United StatesReported employees: 11-50 | New York, NY, United States | 11-50 | Exact match | 32 contacts → |
“Beny Sofer, Inc.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 11 | Leviev Diamondsleviev.com HQ: New York, NY, United StatesReported employees: 11-50 | New York, NY, United States | 11-50 | Exact match | 32 contacts → |
“Leviev Diamonds has been a trusted source of exceptional natural diamonds for polishers, cutters, and jewelers for over three decades.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 12 | Cygni LAB Diamondscygnilab.com HQ: New York, NY, United StatesReported employees: 501-1,000 | New York, NY, United States | 501-1,000 | Exact match | 31 contacts → |
No recorded description excerpt is available for this public record. | |||||
| 13 | Sanghavi Diamonds INCsanghavidiamonds.com HQ: New York, NY, United StatesReported employees: Not recorded | New York, NY, United States | Not recorded | Exact match | 31 contacts → |
“he 'Sanghavi Exports Group' was founded by the four Sanghavi brothers, Vasant, Kirti, Ramesh and Chandrakant in the late 70s, with a great vision of achieving major success &…” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 14 | Labrilliante LLClabrilliante.com HQ: Hoboken, NJ, United StatesReported employees: 11-50 | Hoboken, NJ, United States | 11-50 | Exact match | 30 contacts → |
“Discover how Labrilliante can elevate your business, visit labrilliante.com Who We Are Labrilliante is the trusted B2B supplier of lab-grown diamonds, serving over jewelry…” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 15 | SFD Trading INCviaraz.com HQ: San Francisco, CA, United StatesReported employees: 1-10 | San Francisco, CA, United States | 1-10 | Exact match | 29 contacts → |
“Established in 1985, SFD is a family-owned and operated business.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 16 | Saban Onyx INCsabanonyx.com HQ: New York, NY, United StatesReported employees: 51-200 | New York, NY, United States | 51-200 | Exact match | 27 contacts → |
“Saban Diamonds (founded in 1977) and Onyx Diamonds (founded in 1987) made a name for themselves separately as pioneers in the manufacture of square and rectangular diamonds.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 17 | Clean Origincleanorigin.com HQ: Frisco, TX, United StatesReported employees: 11-50 | Frisco, TX, United States | 11-50 | Exact match | 21 contacts → |
“Clean Origin is a 3rd generation diamond jewelry business, focusing exclusively on ethically sourced, lab grown diamonds.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 18 | Grandview Klein Diamond Groupgkdg.com HQ: New York, NY, United StatesReported employees: 11-50 | New York, NY, United States | 11-50 | Exact match | 20 contacts → |
“Now celebrating 75 years, for three generations, Grandview Klein has been renowned for its diamond cutting expertise and devotion to its clients.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 19 | Yerushalmi Bros. Diamonds LTDyerushalmi.com HQ: Los Angeles, CA, United StatesReported employees: 11-50 | Los Angeles, CA, United States | 11-50 | Exact match | 20 contacts → |
“For over four decades, Yerushalmi Bros.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 20 | DEV Jewelsdevjewels.com HQ: New York, NY, United StatesReported employees: 51-200 | New York, NY, United States | 51-200 | Exact match | 20 contacts → |
“At Dev Jewels, we redefine luxury with our exquisite lab-grown diamond jewelry.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 21 | Jean Doussetjeandousset.com HQ: Los Angeles, CA, United StatesReported employees: 11-50 | Los Angeles, CA, United States | 11-50 | Exact match | 19 contacts → |
“At Jean Dousset, we have a bold vision of a more liberated future.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 22 | Goldenwest Diamond Corporationjewelryexchange.com HQ: Tustin, CA, United StatesReported employees: 201-500 | Tustin, CA, United States | 201-500 | Exact match | 18 contacts → |
“The Jewelry Exchange is the nation’s best online resource for high quality loose diamonds, EGL Diamond, Gia Diamonds, engagement ring and diamond jewelry at the lowest prices.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 23 | Diamond Nexusdiamondnexus.com HQ: Franklin, WI, United StatesReported employees: 51-200 | Franklin, WI, United States | 51-200 | Exact match | 18 contacts → |
“We perfected a stone that is better than a mined diamond: The Contemporary Nexus Diamond™.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 24 | Altr Created Diamondsaltr.nyc HQ: New York, NY, United StatesReported employees: 11-50 | New York, NY, United States | 11-50 | Exact match | 18 contacts → |
“ALTR Created Diamonds are shaping the future of the lab-grown diamond industry.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 25 | Green Rocks Diamondsgreenrocksdiamonds.com HQ: Aventura, FL, United StatesReported employees: 11-50 | Aventura, FL, United States | 11-50 | Exact match | 17 contacts → |
“The world’s finest lab created diamond rough crystal is just half the story.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
Showing 25 of 282 company matches
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Diamond grading laboratories: dataset insights
November 6, 2026These summaries describe recorded coverage in this saved dataset. This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Reported company sizes
280 records in the displayed employee bands.
2 matching records are outside the displayed bands or do not have a displayed size. Bars show shares of the displayed bands.
Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 282 companies.
How this company list was built
Describe a niche in your own words: companies installing commercial solar, or manufacturers of sustainable packaging. RevenueBase SmartSearch finds companies whose compiled business descriptions match by meaning. This list is one saved example to adapt.
Where the company descriptions come from
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
RevenueBase SmartSearch matching settings
- Exact
- Closest fits to the business described.
- Similar
- Similar businesses with a wider range of fits.
- Related
- Related businesses in and around the category.
- Broad
- A broader set of businesses connected to the description.
RevenueBase SmartSearch · Exact match identifies inclusion in this search's closest semantic matching setting. It is not a per-company confidence score, a literal keyword match, or a quality endorsement.
Selection, ordering and scope
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Recorded company descriptions support research; check company websites for current services. The selected preview is ordered by tracked contacts and is not a list of the best service providers.
Snapshot: November 6, 2026.
RevenueBase is a B2B data infrastructure company. Its September 3, 2026 published methodology describes a graph of 60 million companies and 398.9 million professional contacts; these platform figures differ from this page's totals. Published methodology ↗
Diamond grading laboratories by metro
Questions about this company list
What does Exact match mean for diamond grading laboratories?
The separate RevenueBase SmartSearch column identifies inclusion at the closest semantic matching preset. It is not a literal keyword match, a per-company confidence score or a quality endorsement. Changing the search form opens a new search in RevenueBase; it does not reclassify these saved rows.
How many diamond grading laboratories did RevenueBase find based in the United States?
The saved snapshot records 282 matching company records, 2,764 tracked contacts and 656 verified emails. The public preview displays 25 selected records.
Where do the company descriptions come from?
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
How are the public companies ordered?
The selected public records are ordered by contacts tracked in RevenueBase, highest first. Contact coverage is a prospecting measure, not an assessment of the company's services or quality.
How can I get contact information?
Select a company's contact count to open its filtered contacts in RevenueBase. Free signup is required and includes 500 credits and limited free results. Verified emails, direct dials and mobile numbers depend on available coverage.
How current is this list?
Snapshot: November 6, 2026. Review each company's website for current services and locations. A recorded business description does not establish that every company offers every service named in the search.
What do headquarters and employee bands mean?
These are recorded company-level fields, rather than a map of every branch or a count of specialists. Missing headquarters or employee bands are labeled; older records may show a location separately from recorded headquarters.
Build your next target company list
Adapt this niche search and work with available contacts in RevenueBase.
Related lists
Diamond grading laboratories by geography
- Diamond grading laboratories based in Antwerp, Belgium
- Diamond grading laboratories based in Mumbai, India
- Diamond grading laboratories based in Surat, India
- Diamond grading laboratories based in New York, United States
- Diamond grading laboratories based in Australia
- Diamond grading laboratories based in Belgium
- Diamond grading laboratories based in Hong Kong
- Diamond grading laboratories based in India
Cite this list
RevenueBase Data Team. Top 25 diamond grading laboratories based in the United States. Snapshot: November 6, 2026. https://revenuebase.ai/companies/diamond-grading-laboratories/united-states.
This is a selected public preview of saved company records, rather than an independently verified census. Open the source page ↗
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- Diamond grading laboratories based in Antwerp, Belgium
- Diamond grading laboratories based in Mumbai, India
- Diamond grading laboratories based in Surat, India
- Diamond grading laboratories based in New York, United States
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- Diamond grading laboratories based in Belgium