Company lists · Data refreshed September 2026

Top 25 Monocrystalline diamond manufacturers based in the United States

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

Compiled by the RevenueBase Data Team Data refreshed Sep 17, 2026 122 companies tracked

RevenueBase identified 122 monocrystalline diamond manufacturers headquartered in the United States as of September 2026 and tracks 1,207 professional contacts across them, including 296 with verified work emails. New York is the largest hub.

This list covers monocrystalline diamond manufacturers 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 17, 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 17, 2026 86% judged on-target in blind review

122Companies

1,207Contacts tracked

296Verified emails

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The 25 largest monocrystalline diamond manufacturers based in the United States

Ranked by team size

Top 25 of 122 monocrystalline diamond manufacturers based in the United States, ranked by team size, largest first. Data refreshed Sep 17, 2026. RevenueBase Smart Search rates how each company's information relates to monocrystalline diamond manufacturers: 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 17, 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 17, 2026
2	Grown Diamond Corporation	Partial evidence	NY, United StatesHQ checked Sep 17, 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 17, 2026
3	General Tool, INC	Partial evidence	Irvine, CA, United StatesHQ checked Sep 17, 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 17, 2026
4	Kiran Gems USA INC	Strong evidence	New York, United StatesHQ checked Sep 17, 2026	11-50	39 contacts →
	Strong 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 17, 2026
5	Great Lakes Crystal Technologies	Partial evidence	East Lansing, MI, United StatesHQ checked Sep 17, 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 17, 2026
6	Sanghavi Diamonds INC	Indirect evidence	New York, NY, United StatesHQ checked Sep 17, 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 17, 2026
7	Cygni LAB Diamonds	Indirect evidence	New York, NY, United StatesHQ checked Sep 17, 2026	501-1,000	29 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 17, 2026
8	Leviev Diamonds	Partial evidence	New York, NY, United StatesHQ checked Sep 17, 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 17, 2026
9	WD Advanced Materials	Partial evidence	Beltsville, MD, United StatesHQ checked Sep 17, 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 17, 2026
10	Saban Onyx INC	Strong evidence	New York, NY, United StatesHQ checked Sep 17, 2026	51-200	23 contacts →
	Strong 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 17, 2026
11	Sp3 Diamond Technologies	Partial evidence	Santa Clara, CA, United StatesHQ checked Sep 17, 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 17, 2026
12	Altr Created Diamonds	Partial evidence	New York, NY, United StatesHQ checked Sep 17, 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 17, 2026
13	Asahi Diamond America,inc	Indirect evidence	West Chester, CA, United StatesHQ checked Sep 17, 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 17, 2026
14	Grandview Klein Diamond Group	Partial evidence	New York, NY, United StatesHQ checked Sep 17, 2026	11-50	17 contacts →
	Partial evidence “Now celebrating 75 years, for three generations, Grandview Klein has been renowned for its diamond cutting expertise and devotion to its clients.” Source: RevenueBase Database · checked Sep 17, 2026
15	Skylab Diamond	Strong evidence	New York, NY, United StatesHQ checked Sep 17, 2026	501-1,000	17 contacts →
	Strong evidence “As a leading manufacturer, Skylab empowers businesses to present their customers with exceptional lab grown diamonds and jewelry.” Source: RevenueBase Database · checked Sep 17, 2026
16	International Diamond Services, INC	Partial evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	11-50	17 contacts →
	Partial evidence “IDS (International Diamond Services), is a reputable provider of industrial diamond products and services.” Source: RevenueBase Database · checked Sep 17, 2026
17	Green Rocks Diamonds	Partial evidence	Aventura, FL, United StatesHQ checked Sep 17, 2026	11-50	16 contacts →
	Partial evidence “The world’s finest lab created diamond rough crystal is just half the story.” Source: RevenueBase Database · checked Sep 17, 2026
18	Yerushalmi Bros. Diamonds LTD	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 17, 2026	11-50	16 contacts →
	Indirect evidence “For over four decades, Yerushalmi Bros.” Source: RevenueBase Database · checked Sep 17, 2026
19	SY Kessler Sales, INC	Indirect evidence	Dallas, TX, United StatesHQ checked Sep 17, 2026	11-50	15 contacts →
	Indirect evidence “The late Sylvia and Sy Kessler established the company in 1968, and the tradition of servicing its customers has proudly continued for 58 years and three generations.” Source: RevenueBase Database · checked Sep 17, 2026
20	Diamond Nexus	Partial evidence	Franklin, WI, United StatesHQ checked Sep 17, 2026	51-200	15 contacts →
	Partial evidence “We perfected a stone that is better than a mined diamond: The Contemporary Nexus Diamond™.” Source: RevenueBase Database · checked Sep 17, 2026
21	Evolvd	Partial evidence	New York, NY, United StatesHQ checked Sep 17, 2026	51-200	15 contacts →
	Partial evidence “Evolvd cultures diamond in it's in-house manufacturing facility at Surat, India.” Source: RevenueBase Database · checked Sep 17, 2026
22	Worldwide Superabrasives, LLC	Indirect evidence	Boynton Beach, FL, United StatesHQ checked Sep 17, 2026	11-50	13 contacts →
	Indirect evidence “Providing superabrasive products, customer service and technical support that meet and exceed our customers' needs and expectations, while relentlessly pursuing continuous…” Source: RevenueBase Database · checked Sep 17, 2026
23	Creative Diam	Partial evidence	New York, NY, United StatesHQ checked Sep 17, 2026	501-1,000	12 contacts →
	Partial evidence “About Creative Diam Since our inception in 2013, Creative Diam has been a leader in the lab-grown diamond sector.” Source: RevenueBase Database · checked Sep 17, 2026
24	Supercut Abrasives	Partial evidence	Carol Stream, IL, United StatesHQ checked Sep 17, 2026	201-500	12 contacts →
	Partial evidence “SuperCut is a World Leader in Industrial Diamond Tooling Products Used in the Fabrication of Automotive Glass, Flat Glass, Appliance Glass, Solar Glass and Ceramic Tile SuperCut…” Source: RevenueBase Database · checked Sep 17, 2026
25	SHEFI	Indirect evidence	New York, NY, United StatesHQ checked Sep 17, 2026	11-50	12 contacts →
	Indirect evidence “Shefi is a family company.” Source: RevenueBase Database · checked Sep 17, 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: monocrystalline diamond 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 monocrystalline diamond manufacturers.
Partial evidence: Its own public description names part of monocrystalline diamond manufacturers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name monocrystalline diamond 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 122 monocrystalline diamond manufacturers based in the United States

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Monocrystalline diamond manufacturers based in the United States at a glance

As of Sep 17, 2026

24.5%Verified-email coverage

9.9Average contacts per company

11-50Median size (employees)

44.3%Largest-city concentration · New York

Sep 17, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

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 122 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 monocrystalline diamond 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 the United States whose own description of what they do matches “monocrystalline diamond 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 monocrystalline diamond 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 monocrystalline diamond manufacturers, 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, 296 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 17, 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.

Monocrystalline diamond manufacturers by metro

Monocrystalline diamond manufacturers in New York54

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 monocrystalline diamond 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 monocrystalline diamond manufacturers are there based in the United States?

RevenueBase identified 122 monocrystalline diamond manufacturers 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 monocrystalline diamond manufacturers?

New York leads with 54 headquartered companies, followed by Los Angeles (6) and Austin (2).

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 296 verified decision-maker contacts tracked across these 122 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 17, 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.