Company lists · Data refreshed September 2026

Top 25 Diamond certification companies worldwide

Name: Diamond certification companies worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 1,987 companies tracked

RevenueBase identified 1,987 diamond certification companies worldwide as of September 2026 and tracks 23,759 professional contacts across them, including 4,215 with verified work emails. India is the largest market and Mumbai the largest hub.

This list covers diamond certification companies worldwide, 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 19, 2026. Country and city lists for diamond certification companies follow the table.

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 19, 2026 86% judged on-target in blind review

1,987Companies

23,759Contacts tracked

4,215Verified emails

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The 25 largest diamond certification companies worldwide

Ranked by team size

Top 25 of 1,987 diamond certification companies worldwide, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to diamond certification companies: 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	Kiran Gems Private Limited	Partial evidence	Mumbai, IndiaHQ checked Sep 19, 2026	10001+	1,052 contacts →
	Partial evidence “KIRAN GEMS is the World’s Largest Manufacturer of Natural Diamonds and India’s Premier Diamantaire, establishing benchmarks not just for sheer scale of operations, but also for…” Source: RevenueBase Database · checked Sep 19, 2026
2	Blue Nile	Partial evidence	New York, NY, United StatesHQ checked Sep 19, 2026	501-1,000	858 contacts →
	Partial evidence “Blue Nile was founded in with the idea that the diamond and engagement ring business was ready for innovation.” Source: RevenueBase Database · checked Sep 19, 2026
3	Rosy Blue	Partial evidence	Antwerp, BelgiumHQ checked Sep 19, 2026	5,001-10,000	467 contacts →
	Partial evidence “Rosy Blue is one of the most renowned diamond and jewelry companies in the world.” Source: RevenueBase Database · checked Sep 19, 2026
4	Dharmanandan Diamonds Pvt. LTD	Partial evidence	Mumbai, IndiaHQ checked Sep 19, 2026	5,001-10,000	415 contacts →
	Partial evidence “Dharmanandan Diamonds, widely known as DDPL is a prominent natural diamond manufacturing company.” Source: RevenueBase Database · checked Sep 19, 2026
5	International Gemological Institute - USA	Indirect evidence	New York, NY, United StatesHQ checked Sep 19, 2026	501-1,000	394 contacts →
	Indirect evidence “IGI, a Blackstone portfolio company, is the world’s largest independent provider of gemological services.” Source: RevenueBase Database · checked Sep 19, 2026
6	ZEN Pırlanta	Indirect evidence	Bahçelievler / Istanbul, TürkiyeHQ checked Sep 19, 2026	201-500	370 contacts →
	Indirect evidence “Zen Pırlanta- Türkiye’nin pırlanta uzmanı- 1890’lara uzanan köklü geçmişe sahip bir marka- Türkiye’nin en çok tercih edilen pırlanta markası- Avrupa ve Ortadoğu’nun en büyük…” Source: RevenueBase Database · checked Sep 19, 2026
7	Kama Jewelry	Partial evidence	New York, NY, United StatesHQ checked Sep 19, 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 19, 2026
8	Uni-Design	Indirect evidence	Mumbai, IndiaHQ checked Sep 19, 2026	501-1,000	267 contacts →
	Indirect evidence “As pioneers in the jewellery industry, we are well-known for our high quality, reliability, and prompt customer service.We have a global footprint and collaborate with brands from…” Source: RevenueBase Database · checked Sep 19, 2026
9	Asian Star Company Limited	Partial evidence	Mumbai, IndiaHQ checked Sep 19, 2026	1,001-5,000	249 contacts →
	Partial evidence “OUR HERITAGE: The Asian Star group represents a rich heritage of values, skills and experience, amassed over five decades in the diamond industry.” Source: RevenueBase Database · checked Sep 19, 2026
10	Laxmi Diamond Pvt. LTD	Partial evidence	Surat, IndiaHQ checked Sep 19, 2026	5,001-10,000	248 contacts →
	Partial evidence “Established in 1972, Laxmi Diamond is one of the leading diamond manufacturers, with its footprints spread across the globe.” Source: RevenueBase Database · checked Sep 19, 2026
11	HRD Antwerp	Partial evidence	Antwerp, BelgiumHQ checked Sep 19, 2026	201-500	234 contacts →
	Partial evidence “HRD Antwerp is the leading authority when it comes to Diamond Grading, Jewellery Grading and Education.” Source: RevenueBase Database · checked Sep 19, 2026
12	Goldstar Jewellery	Partial evidence	Mumbai, IndiaHQ checked Sep 19, 2026	1,001-5,000	225 contacts →
	Partial evidence “Established in 1962, Goldstar is a trusted name in the diamond and jewellery industry.” Source: RevenueBase Database · checked Sep 19, 2026
13	Rapaport	Indirect evidence	New York, NY, United StatesHQ checked Sep 19, 2026	51-200	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 19, 2026
14	Dimexon Diamonds	Partial evidence	Mumbai, IndiaHQ checked Sep 19, 2026	1,001-5,000	199 contacts →
	Partial evidence “Dimexon Diamonds Ltd, with sales offices in all 4 corners of the globe, is one of the world’s leading diamond manufacturers.” Source: RevenueBase Database · checked Sep 19, 2026
15	Muller	Indirect evidence	Zoutleeuw, BelgiumHQ checked Sep 19, 2026	501-1,000	195 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 19, 2026
16	SGL Labs	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	201-500	175 contacts →
	Indirect evidence “Peace of mind, Assured.” Source: RevenueBase Database · checked Sep 19, 2026
17	Rare Carat	Partial evidence	New York City, NY, United StatesHQ checked Sep 19, 2026	51-200	168 contacts →
	Partial evidence “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…” Source: RevenueBase Database · checked Sep 19, 2026
18	Hearts On Fire	Partial evidence	Hong KongHQ checked Sep 19, 2026	201-500	166 contacts →
	Partial evidence “HEARTS ON FIRE® is a modern diamond jewelry brand renowned for the beauty of its signature cut diamonds.” Source: RevenueBase Database · checked Sep 19, 2026
19	Gemological Science International GSI	Indirect evidence	Manhattan, United StatesHQ checked Sep 19, 2026	51-200	160 contacts →
	Indirect evidence “Gemological Science International (GSI) is one of the largest gemological laboratories with 13 offices in the United States, India, UAE, Hong Kong and Thailand.” Source: RevenueBase Database · checked Sep 19, 2026
20	Blue Diamond	Partial evidence	İstanbul, TürkiyeHQ checked Sep 19, 2026	1,001-5,000	144 contacts →
	Partial evidence “Blue Diamond, 2004 yılında toptancı bir firma olarak, mücevher sektörüne pırlanta tedarik etmek ve sektörü pırlanta konusunda eğitmek amacıyla kuruldu.” Source: RevenueBase Database · checked Sep 19, 2026
21	Ankit Gems	Indirect evidence	Mumbai, IndiaHQ checked Sep 19, 2026	1,001-5,000	126 contacts →
	Indirect evidence “A dream company started by three visionaries; Arvind Shah, Arun Shah and Dilip Shah in 1985, was then strengthened by Vasant Shah, Pravin Shah and Dilip Soni, bringing together…” Source: RevenueBase Database · checked Sep 19, 2026
22	Bafleh Jewellery	Indirect evidence	Deira, United Arab EmiratesHQ checked Sep 19, 2026	201-500	126 contacts →
	Indirect evidence “Bafleh Jewellery is one of the leading wholesale jewellery company in UAE.” Source: RevenueBase Database · checked Sep 19, 2026
23	Kapu Gems	Indirect evidence	Mumbai, IndiaHQ checked Sep 19, 2026	501-1,000	122 contacts →
	Indirect evidence “For over six decades, Kapu Gems has been more than a manufacturer.” Source: RevenueBase Database · checked Sep 19, 2026
24	International Diamond Center	Partial evidence	Clearwater, FL, United StatesHQ checked Sep 19, 2026	51-200	111 contacts →
	Partial evidence “Founded by Keith Leclerc in 1981, International Diamond Center began as a jewelry wholesaler.” Source: RevenueBase Database · checked Sep 19, 2026
25	Suashish Diamonds Limited	Partial evidence	Mumbai, IndiaHQ checked Sep 19, 2026	201-500	109 contacts →
	Partial evidence “Suashish Diamonds Ltd.” Source: RevenueBase Database · checked Sep 19, 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: diamond certification companies. 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 diamond certification companies.
Partial evidence: Its own public description names part of diamond certification companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name diamond certification companies. 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 1,987 diamond certification companies worldwide

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Diamond certification companies worldwide at a glance

As of Sep 19, 2026

17.7%Verified-email coverage

12.0Average contacts per company

1-10Median size (employees)

9.0%Largest-city concentration · Mumbai

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

1,004

11-50

560

51-200

197

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency is reported on each country list linked below.

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 diamond certification companies, 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.
Coverage: Every country. Country and city lists for diamond certification companies are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “diamond certification companies”. 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 diamond certification companies), 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 diamond certification companies, and records with no verified work email.
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, 4,215 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 19, 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.

Diamond certification companies by location

12 lists · largest first

Every Diamond certification companies list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

Cities

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 diamond certification companies, 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 diamond certification companies are there worldwide?

RevenueBase identified 1,987 diamond certification companies worldwide 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?

Kiran Gems Private Limited, headquartered in Bandra East Mumbai, tops this list with the largest team on record.

Which country has the most diamond certification companies?

India leads with 544 companies, followed by the United States (404) and the United Kingdom (72). Every diamond certification companies list by country and city is linked on this page.

Which city has the most diamond certification companies?

Mumbai leads with 179 headquartered companies, followed by New York (165) and Surat (153).

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 4,215 verified decision-maker contacts tracked across these 1,987 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 19, 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.