Company lists · Data refreshed September 2026

Top 14 Lab-grown diamond manufacturers based in the United Kingdom

Name: Lab-grown diamond manufacturers based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 17, 2026 49 companies tracked

RevenueBase identified 49 lab-grown diamond manufacturers headquartered in the United Kingdom as of September 2026 and tracks 506 professional contacts across them, including 107 with verified work emails. London is the largest hub.

This list covers lab-grown diamond manufacturers headquartered in the United Kingdom, 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

49Companies

506Contacts tracked

107Verified emails

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The 14 largest lab-grown diamond manufacturers based in the United Kingdom

Ranked by team size

Top 14 of 49 lab-grown diamond manufacturers based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 17, 2026. RevenueBase Smart Search rates how each company's information relates to lab-grown 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	Queensmith	Indirect evidence	London, United KingdomHQ checked Sep 17, 2026	51-200	59 contacts →
	Indirect evidence “At Queensmith, we believe jewellery should be as unique as the stories it represents.” Source: RevenueBase Database · checked Sep 17, 2026
2	Henig Diamonds	Partial evidence	London, United KingdomHQ checked Sep 17, 2026	11-50	23 contacts →
	Partial evidence “For over 30 years, Henig Diamonds has been at the heart of the UK diamond trade, proudly supplying jewellers, wholesalers, and retailers across Europe.” Source: RevenueBase Database · checked Sep 17, 2026
3	Mireya	Partial evidence	Clerkenwell, United KingdomHQ checked Sep 17, 2026	11-50	17 contacts →
	Partial evidence “Mireya UK Ltd prides itself in offering integrated business solutions for diamond & diamond jewellery retailers.” Source: RevenueBase Database · checked Sep 17, 2026
4	KIMAI	Strong evidence	London, United KingdomHQ checked Sep 17, 2026	1-10	16 contacts →
	Strong evidence “Kimai is a fine jewelry brand creating delicate designs using only lab-grown diamonds & 18k recycled gold.” Source: RevenueBase Database · checked Sep 17, 2026
5	Harmony Jewels London	Indirect evidence	London, United KingdomHQ checked Sep 17, 2026	1-10	12 contacts →
	Indirect evidence “Fine jewellery made bespoke just for you” Source: RevenueBase Database · checked Sep 17, 2026
6	GEM Diamonds Limited	Partial evidence	London, United KingdomHQ checked Sep 17, 2026	51-200	11 contacts →
	Partial evidence “Gem Diamonds is a leading global diamond producer of high value diamonds.” Source: RevenueBase Database · checked Sep 17, 2026
7	Skydiamond	Indirect evidence	Stroud, United KingdomHQ checked Sep 17, 2026	11-50	8 contacts →
	Indirect evidence “At the intersection of luxury and conscience, Skydiamond inspires you to wear your values.” Source: RevenueBase Database · checked Sep 17, 2026
8	Angelic Diamonds	Partial evidence	Cramlington, United KingdomHQ checked Sep 17, 2026	1-10	4 contacts →
	Partial evidence “Welcome to Angelic Diamonds.” Source: RevenueBase Database · checked Sep 17, 2026
9	Sunshine Exim LTD	Indirect evidence	London, United KingdomHQ checked Sep 17, 2026	1-10	3 contacts →
	Indirect evidence “Sunshine Exim was established in 1989.” Source: RevenueBase Database · checked Sep 17, 2026
10	247 Diamonds Limited	Indirect evidence	Salford Priors, United KingdomHQ checked Sep 17, 2026	1-10	3 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 17, 2026
11	Serendipity Diamonds	Partial evidence	Ryde, United KingdomHQ checked Sep 17, 2026	1-10	2 contacts →
	Partial evidence “At Serendipity Diamonds, our small and friendly team of jewellery and diamond experts innovate and create fine diamond jewellery with exceptional value and meaning.” Source: RevenueBase Database · checked Sep 17, 2026
12	Shining Qualities	Partial evidence	Bath, United KingdomHQ checked Sep 17, 2026	1-10	1 contacts →
	Partial evidence “We are diamond specialists for independent jewellers and jewellery designers, sourcing and delivering quality-assured diamonds for our clients through our Diamond Buying Concierge…” Source: RevenueBase Database · checked Sep 17, 2026
13	Verde Diamonds	Strong evidence	London, United KingdomHQ checked Sep 17, 2026	1-10	1 contacts →
	Strong evidence “Verde Diamonds specialise in lab-grown & Mined diamonds, Our team have a rich and varied experience in the world of diamonds across wholesale and retail totalling over 35 years.” Source: RevenueBase Database · checked Sep 17, 2026
14	Juvetti	Strong evidence	London, United KingdomHQ checked Sep 17, 2026	1-10	1 contacts →
	Strong evidence “Juvetti specialises in high quality lab-grown gemstones and fine jewellery.” 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: lab-grown 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 lab-grown diamond manufacturers.
Partial evidence: Its own public description names part of lab-grown diamond manufacturers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name lab-grown 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 14 of 49 lab-grown diamond manufacturers based in the United Kingdom

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Lab-grown diamond manufacturers based in the United Kingdom at a glance

As of Sep 17, 2026

21.1%Verified-email coverage

10.3Average contacts per company

1-10Median size (employees)

55.1%Largest-city concentration · London

Sep 17, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

Email recency for this list is measured worldwide rather than for United Kingdom, so it is reported there. Company counts and contact totals on this page are exact for United Kingdom, over 49 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 lab-grown 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 Kingdom whose own description of what they do matches “lab-grown 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 lab-grown 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 lab-grown diamond manufacturers, and records with no verified work email. Companies headquartered outside United Kingdom 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, 107 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.

Lab-grown diamond manufacturers by metro

Lab-grown diamond manufacturers in London27

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 lab-grown 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 lab-grown diamond manufacturers are there based in the United Kingdom?

RevenueBase identified 49 lab-grown diamond manufacturers headquartered in the United Kingdom 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?

Queensmith, headquartered in London, tops this list with the largest team on record.

Which city has the most lab-grown diamond manufacturers?

London leads with 27 headquartered companies, followed by Glasgow (2) and Bath (1).

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 107 verified decision-maker contacts tracked across these 49 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.