Company lists · Data refreshed September 2026

Top 25 Synthetic diamond producers based in the United States

Name: Synthetic diamond producers based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 22, 2026 233 companies tracked

RevenueBase identified 233 synthetic diamond producers headquartered in the United States as of September 2026 and tracks 2,173 professional contacts across them, including 522 with verified work emails. New York is the largest hub.

This list covers synthetic diamond producers headquartered in the 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 22, 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.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 22, 2026 86% judged on-target in blind review

233Companies

2,173Contacts tracked

522Verified emails

Explore this list → Free signup · no credit card · 500 free credits

The 25 largest synthetic diamond producers based in the United States

Ranked by team size

Top 25 of 233 synthetic diamond producers based in the United States, ranked by team size, largest first. Data refreshed Sep 22, 2026. RevenueBase Smart Search rates how each company's information relates to synthetic diamond producers: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Kama Jewelry	Partial evidence	New York, NY, United StatesHQ checked Sep 22, 2026	1,001-5,000	275 contacts →
	Partial 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 22, 2026
2	Maitri Diamonds INC	Partial evidence	New York, NY, United StatesHQ checked Sep 22, 2026	1,001-5,000	71 contacts →
	Partial evidence “Maitri Diamonds manufactures the perfectly sustainable alternative to naturally sourced mined diamonds – Lab-grown Diamonds.” Source: RevenueBase Database · checked Sep 22, 2026
3	Charles & Colvard, LTD	Indirect evidence	Morrisville, NC, United StatesHQ checked Sep 22, 2026	51-200	63 contacts →
	Indirect evidence “Charles & Colvard (OTC: CTHR) believes fine jewelry can be accessible, beautiful and conscientious.” Source: RevenueBase Database · checked Sep 22, 2026
4	Grown Diamond Corporation	Partial evidence	NY, United StatesHQ checked Sep 22, 2026	11-50	50 contacts →
	Partial evidence “Grown Diamond Corporation was established in 2012, where along with our partners we have invested strongly over the years in advanced/disruptive technologies to successfully grow…” Source: RevenueBase Database · checked Sep 22, 2026
5	ASHI	Partial evidence	New York, NY, United StatesHQ checked Sep 22, 2026	51-200	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 22, 2026
6	Aneri Jewels	Partial evidence	New York, NY, United StatesHQ checked Sep 22, 2026	501-1,000	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 22, 2026
7	General Tool, INC	Partial evidence	Irvine, CA, United StatesHQ checked Sep 22, 2026	51-200	39 contacts →
	Partial evidence “General Tool is a privately-owned diamond tool manufacturing company headquartered in Irvine, California.” Source: RevenueBase Database · checked Sep 22, 2026
8	Kiran Gems USA INC	Partial evidence	New York, United StatesHQ checked Sep 22, 2026	11-50	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 22, 2026
9	The Diamond Port	Partial evidence	New York, NY, United StatesHQ checked Sep 22, 2026	11-50	38 contacts →
	Partial evidence “Join Fastest Growing B2B diamond Marketplace The Diamond Port streamlines your diamond sourcing.” Source: RevenueBase Database · checked Sep 22, 2026
10	Great Lakes Crystal Technologies	Partial evidence	East Lansing, MI, United StatesHQ checked Sep 22, 2026	11-50	35 contacts →
	Partial evidence “GLCT's mission is to become the leading provider of high-performance crystalline diamond materials for high-technology applications” Source: RevenueBase Database · checked Sep 22, 2026
11	Sanghavi Diamonds INC	Indirect evidence	New York, NY, United StatesHQ checked Sep 22, 2026	n/a	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 22, 2026
12	Ascot Diamonds	Partial evidence	Atlanta, GA, United StatesHQ checked Sep 22, 2026	11-50	30 contacts →
	Partial evidence “Ascot Diamonds is a jewelry store with locations in Atlanta, Washington DC, Dallas, New York, Charlotte, Charleston SC, and Philadelphia.” Source: RevenueBase Database · checked Sep 22, 2026
13	Cygni LAB Diamonds	Indirect evidence	New York, NY, United StatesHQ checked Sep 22, 2026	501-1,000	29 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 22, 2026
14	Leviev Diamonds	Partial evidence	New York, NY, United StatesHQ checked Sep 22, 2026	11-50	29 contacts →
	Partial 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 22, 2026
15	Beny Sofer INC	Indirect evidence	New York, NY, United StatesHQ checked Sep 22, 2026	11-50	28 contacts →
	Indirect evidence “Beny Sofer, Inc.” Source: RevenueBase Database · checked Sep 22, 2026
16	SFD Trading INC	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 22, 2026	1-10	28 contacts →
	Indirect evidence “Established in 1985, SFD is a family-owned and operated business.” Source: RevenueBase Database · checked Sep 22, 2026
17	Labrilliante LLC	Partial evidence	Hoboken, NJ, United StatesHQ checked Sep 22, 2026	11-50	27 contacts →
	Partial evidence “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…” Source: RevenueBase Database · checked Sep 22, 2026
18	Amipi INC	Indirect evidence	New York, United StatesHQ checked Sep 22, 2026	11-50	27 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 22, 2026
19	WD Advanced Materials	Partial evidence	Beltsville, MD, United StatesHQ checked Sep 22, 2026	11-50	24 contacts →
	Partial evidence “WD Advanced Materials, LLC is a forward-thinking, pioneering technology company and market leader in Chemical Vapor Deposition (CVD) diamond growth, with headquarters in the…” Source: RevenueBase Database · checked Sep 22, 2026
20	Saban Onyx INC	Partial evidence	New York, NY, United StatesHQ checked Sep 22, 2026	51-200	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 22, 2026
21	Sp3 Diamond Technologies	Partial evidence	Santa Clara, CA, United StatesHQ checked Sep 22, 2026	11-50	19 contacts →
	Partial evidence “sp3 Diamond Technologies is a global leader in polycrystalline CVD diamond products and services.” Source: RevenueBase Database · checked Sep 22, 2026
22	Labon LLC	Partial evidence	New York, United StatesHQ checked Sep 22, 2026	11-50	18 contacts →
	Partial evidence “Labon Diamonds” Source: RevenueBase Database · checked Sep 22, 2026
23	Altr Created Diamonds	Partial evidence	New York, NY, United StatesHQ checked Sep 22, 2026	11-50	18 contacts →
	Partial evidence “ALTR Created Diamonds are shaping the future of the lab-grown diamond industry.” Source: RevenueBase Database · checked Sep 22, 2026
24	Asahi Diamond America,inc	Indirect evidence	West Chester, CA, United StatesHQ checked Sep 22, 2026	11-50	18 contacts →
	Indirect evidence “For years, our products have been making contributions to the improvement of varied manufacturing processes in many industries.” Source: RevenueBase Database · checked Sep 22, 2026
25	Ritzin	Indirect evidence	New York, NY, United StatesHQ checked Sep 22, 2026	11-50	18 contacts →
	Indirect evidence “Founded in 2015, Ritzin is the global leader in ethically sourced in the Gems and jewelry Industry.” Source: RevenueBase Database · checked Sep 22, 2026

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: synthetic diamond producers. 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 synthetic diamond producers.
Partial evidence: Its own public description names part of synthetic diamond producers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name synthetic diamond producers. 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 233 synthetic diamond producers based in the United States

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 522 reachable decision-makers.

Free signup · no credit card

View the full list →

Synthetic diamond producers based in the United States at a glance

As of Sep 22, 2026

24.0%Verified-email coverage

9.3Average contacts per company

11-50Median size (employees)

48.9%Largest-city concentration · New York

Sep 22, 2026Page data refreshed

Companies by employee count

1-10

106

11-50

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

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 233 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 synthetic diamond producers, 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 the United States whose own description of what they do matches “synthetic diamond producers”. 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 synthetic diamond producers), 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 synthetic diamond producers, and records with no verified work email. Companies headquartered outside United States 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, 522 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 22, 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.

Synthetic diamond producers by metro

Synthetic diamond producers in New York114

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 synthetic diamond producers, 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 synthetic diamond producers are there based in the United States?

RevenueBase identified 233 synthetic diamond producers headquartered in the 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?

Kama Jewelry, headquartered in New York, tops this list with the largest team on record.

Which city has the most synthetic diamond producers?

New York leads with 114 headquartered companies, followed by Los Angeles (14) and Dallas (5).

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 522 verified decision-maker contacts tracked across these 233 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 22, 2026.

Ready to reach these companies? Verified emails and direct dials for all 233 synthetic diamond producers based in the United States. Start with a free account, no credit card.

Download this list →

Related lists

Synthetic diamond producers by geography

Browse the directory

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.