Company lists · Data refreshed September 2026
Top 25 Gemstone manufacturers based in New York, United States
RevenueBase identified 353 gemstone manufacturers headquartered in New York, United States as of September 2026 and tracks 3,597 professional contacts across them, including 802 with verified work emails. New York is the largest hub.
This list covers gemstone manufacturers headquartered in New York, United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 16, 2026.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, 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 gemstone manufacturers based in New York, United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 394 contacts → | ||||
Indirect evidence “IGI, a Blackstone portfolio company, is the world’s largest independent provider of gemological services.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 2 | 275 contacts → | ||||
Indirect evidence “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…” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 3 | 268 contacts → | ||||
Indirect evidence “Artisan Handcrafted Since 1975 Drawing inspiration from Bali’s elemental beauty, we are guided by our heritage of artistry and reverence for nature in everything we do.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 4 | 204 contacts → | ||||
Indirect evidence “The Rapaport Group is an international network of companies providing first class, added value services that support the development of free, fair, efficient and competitive…” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 5 | 98 contacts → | ||||
Indirect evidence “H.K.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 6 | 64 contacts → | ||||
Indirect evidence “Kwiat is a 115 year-old, family owned and operated diamond jewelry house based in New York City.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 7 | 46 contacts → | ||||
Partial evidence “ASHI is one of the premier diamond jewelry manufacturers servicing over of the finest Independent Retail Jewelers in North America for over 40 years.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 8 | 42 contacts → | ||||
Partial evidence “We are a vertically-integrated diamond jewelry manufacturer that sells to the top jewelry retailers and independents in jewelry industry.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 9 | 39 contacts → | ||||
Partial evidence “Kiran Gems is the world's largest manufacturer and supplier of polished natural diamonds, establishing benchmarks not just for sheer scale of operations, but also for product…” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 10 | 38 contacts → | ||||
Indirect evidence “Join Fastest Growing B2B diamond Marketplace The Diamond Port streamlines your diamond sourcing.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 11 | 38 contacts → | ||||
Partial evidence “The International Colored Gemstone Association (ICA), a non-profit 501(c)6, is the only worldwide body specifically created to benefit the global colored gemstone industry.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 12 | 34 contacts → | ||||
Indirect evidence “One of the constant and consistent underlying consequences of the evolution of our company has been our re-focused attention to the ever-changing fashion influences dictated by…” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 13 | 32 contacts → | ||||
Indirect evidence “Sapphire Specialists, in New York City Since 1939.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 14 | 31 contacts → | ||||
Indirect evidence “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 &…” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 15 | 29 contacts → | ||||
Indirect evidence Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 16 | 29 contacts → | ||||
Indirect evidence “Leviev Diamonds has been a trusted source of exceptional natural diamonds for polishers, cutters, and jewelers for over three decades.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 17 | 28 contacts → | ||||
Indirect evidence “Beny Sofer, Inc.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 18 | 27 contacts → | ||||
Indirect evidence Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 19 | 26 contacts → | ||||
Indirect evidence “Since its establishment in 1959, Ultimate Diamond has grown from a small family-owned business to a leading player in the jewelry industry.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 20 | 23 contacts → | ||||
Indirect evidence “At Sandeep Diamond Corporation, we have developed a reputation as a best-in-class vendor partner to the major jewelry retailers in North America for over 30 years.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 21 | 23 contacts → | ||||
Partial evidence “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.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 22 | 23 contacts → | ||||
Strong evidence “Jewelmak is a fine jewelry design and manufacturer that provides gemstone gold and silver jewelry to retailers worldwide.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 23 | 22 contacts → | ||||
Indirect evidence “Anna Sheffield Jewelry offers a timeless alternative to the traditional world of Ceremonial and Fine jewelry with an extensive collection of finely crafted baubles.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 24 | 20 contacts → | ||||
Indirect evidence “Step into the world of Hueb, where passion & creativity intertwine in a symphony of timeless elegance & modern allure.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 25 | 20 contacts → | ||||
Indirect evidence “Classic Stone is a global natural stone provider committed to supply chain innovation with a quarry-to-project service approach.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
RevenueBase Smart Search
RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: gemstone manufacturers. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.
- Strong evidence
- The company's own public description of its business names gemstone manufacturers.
- Partial evidence
- Its own public description names part of gemstone manufacturers, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name gemstone manufacturers. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.
RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.
Showing 25 of 353 gemstone manufacturers based in New York, United States
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Gemstone manufacturers based in New York, United States at a glance
As of Sep 16, 2026Companies by employee count
Email recency for this list is measured across the whole United States list rather than for New York, so it is reported there. Company counts and contact totals on this page are exact for New York, over 353 companies.
How this list was built
Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among gemstone manufacturers, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
- What qualifies
- Companies headquartered in New York, United States whose own description of what they do matches “gemstone manufacturers”. Matching reads each company's description, not its industry code or its name.
- RevenueBase Smart Search
- RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names gemstone manufacturers), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
- What we exclude
- Companies whose own description does not clearly place them among gemstone manufacturers, and records with no verified work email. Companies headquartered outside New York are excluded even when they keep an office there.
- Match quality
- In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
- 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 listed company carries at least one verified work email, 802 across the full list. 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 September 16, 2026. Lists refresh periodically as the graph is re-checked.
- Corrections
- Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.
Gemstone manufacturers by metro in the United States
- Gemstone manufacturers in New York353
- Gemstone manufacturers in Los Angeles80
- Gemstone manufacturers in Houston44
- Gemstone manufacturers in Dallas35
- Gemstone manufacturers in Chicago32
- Gemstone manufacturers in Miami25
Frequently asked
What is RevenueBase Smart Search?
RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names gemstone manufacturers, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.
How many gemstone manufacturers are there based in New York, United States?
RevenueBase identified 353 gemstone manufacturers headquartered in New York, United States as of September 2026, matched on each company's own description of what it does rather than its industry code.
What is the largest company on this list?
International Gemological Institute - USA, headquartered in New York, tops this list with the largest team on record.
Which city has the most gemstone manufacturers?
New York leads with 353 headquartered companies, followed by Los Angeles (80) and Houston (44).
How do I get contact information for these companies?
A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 802 verified decision-maker contacts tracked across these 353 companies.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 16, 2026.
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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 Smart Search, 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.
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