Company lists · Data refreshed November 2026

Top 25 Diamond jewelry certification services based in the United Kingdom

Name: Diamond jewelry certification services based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Nov 6, 2026 149 companies tracked

RevenueBase identified 149 company matches for diamond jewelry certification services associated with the United Kingdom as of November 2026 and tracks 1,139 professional contacts across them, including 333 with verified work emails. London is the largest hub.

This list covers company matches for diamond jewelry certification services associated with the United Kingdom, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed November 6, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 RevenueBase SmartSearch · Exact Recorded Nov 6, 2026 How this list was built

149Companies

1,139Contacts tracked

333Verified emails

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The 25 largest diamond jewelry certification services based in the United Kingdom

Ranked by team size

Top 25 of 149 company matches for diamond jewelry certification services based in the United Kingdom, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Nov 6, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	Jessica Mccormack	Exact match	London, United KingdomHQ recorded Nov 6, 2026	51-200	133 contacts →
	Exact match “Jessica McCormack is a London-based diamond jewellery brand renowned for its distinctive antique-meets-modern aesthetic.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
2	Queensmith	Exact match	London, United KingdomHQ recorded Nov 6, 2026	51-200	67 contacts →
	Exact match “At Queensmith, we believe jewellery should be as unique as the stories it represents.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
3	Birmingham Assay Office	Exact match	Birmingham, United KingdomHQ recorded Nov 6, 2026	51-200	66 contacts →
	Exact match “The Birmingham Assay Office was founded in 1773 to provide Assaying (testing) and Hallmarking of precious metal items (Gold, Silver, Platinum and Palladium) as required by the…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
4	Responsible Jewellery Council	Exact match	London, United KingdomHQ recorded Nov 6, 2026	11-50	52 contacts →
	Exact match “United by a shared belief that responsible business is good business, we work together with our members and partners to create a globally sustainable future for our industry.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
5	Gem-A	Exact match	London, United KingdomHQ recorded Nov 6, 2026	11-50	51 contacts →
	Exact match “Creating and supporting gemmologists since 1908.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
6	Diamond Heaven	Exact match	Birmingham, United KingdomHQ recorded Nov 6, 2026	51-200	38 contacts →
	Exact match “Established in 2004, Diamond Heaven is an award winning jeweller based in the U.K’s historic Jewellery Quarter, Birmingham.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
7	Henig Diamonds	Exact match	London, United KingdomHQ recorded Nov 6, 2026	11-50	28 contacts →
	Exact match “For over 30 years, Henig Diamonds has been at the heart of the UK diamond trade, proudly supplying jewellers, wholesalers, and retailers across Europe.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
8	Beverley Hills Group	Exact match	London, United KingdomHQ recorded Nov 6, 2026	11-50	26 contacts →
	Exact match “Founded in 1987, and for over 30 years has become synonymous with high-quality jewellery at competitive prices.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
9	Mireya	Exact match	Clerkenwell, United KingdomHQ recorded Nov 6, 2026	11-50	19 contacts →
	Exact match “Mireya UK Ltd prides itself in offering integrated business solutions for diamond & diamond jewellery retailers.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
10	Samara James	Exact match	Shepperton, United KingdomHQ recorded Nov 6, 2026	11-50	12 contacts →
	Exact match “Samara James is an award winning jeweller specialising in perfectly cut diamonds.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
11	Harmony Jewels London	Exact match	London, United KingdomHQ recorded Nov 6, 2026	1-10	12 contacts →
	Exact match “Fine jewellery made bespoke just for you” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
12	Lily Arkwright	Exact match	Manchester, United KingdomHQ recorded Nov 6, 2026	11-50	10 contacts →
	Exact match “Lily Arkwright is an award-winning British fine jewellery brand specialising in lab-grown diamonds, moissanite and lab-grown coloured gemstones.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
13	Skydiamond	Exact match	Stroud, United KingdomHQ recorded Nov 6, 2026	11-50	8 contacts →
	Exact match “At the intersection of luxury and conscience, Skydiamond inspires you to wear your values.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
14	Angelic Diamonds	Exact match	Cramlington, United KingdomHQ recorded Nov 6, 2026	1-10	8 contacts →
	Exact match “Welcome to Angelic Diamonds.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
15	Bass Premier CO	Exact match	London, United KingdomHQ recorded Nov 6, 2026	11-50	7 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
16	Emdico	Exact match	London, United KingdomHQ recorded Nov 6, 2026	11-50	6 contacts →
	Exact match “Founded in 1985, Emdico (London) Limited is a diamond specialist with a strong global presence.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
17	Mcgowans Jewellers	Exact match	Glasgow, United KingdomHQ recorded Nov 6, 2026	11-50	6 contacts →
	Exact match “Over the many years since McGowans was first established in 1895, the company has come to be known as one of the most reputable jewellers in Scotland.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
18	Backes & Strauss	Exact match	London, United KingdomHQ recorded Nov 6, 2026	51-200	6 contacts →
	Exact match “As the world’s oldest diamond company (est.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
19	Quality Diamonds	Exact match	London, United KingdomHQ recorded Nov 6, 2026	1-10	5 contacts →
	Exact match “Quality Diamonds are wholly committed to providing the very best diamond buying experience.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
20	Alan Bick Limited	Exact match	London, United KingdomHQ recorded Nov 6, 2026	1-10	5 contacts →
	Exact match “ALAN BICK LIMITED is a diamond merchants and jewellery manufacturers, based out of 100 Hatton Garden, Holborn, LONDON, United Kingdom.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
21	Primo Diamonds	Exact match	England, United KingdomHQ recorded Nov 6, 2026	1-10	5 contacts →
	Exact match “Primo Diamonds is a London-based diamond specialist, offering an extensive range of engagement rings, wedding rings and loose diamonds.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
22	Bobby White Limited	Exact match	London, United KingdomHQ recorded Nov 6, 2026	1-10	4 contacts →
	Exact match “Bobby White is a London-based creative jewellery powerhouse founded by designer Bobby in 2004.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
23	Aariya Diamonds	Exact match	Croydon, United KingdomHQ recorded Nov 6, 2026	1-10	4 contacts →
	Exact match “Aariya Diamonds create bespoke diamond jewellery globally with new collections of high jewellery with a contemporary edgy style.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
24	Monnickendam Diamonds	Exact match	London, United KingdomHQ recorded Nov 6, 2026	11-50	3 contacts →
	Exact match “Monnickendam Diamonds is one of the oldest and largest sellers of loose and certified diamonds in the UK.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
25	comparethediamond.com	Exact match	Bourton On The Water, United KingdomHQ recorded Nov 6, 2026	1-10	3 contacts →
	Exact match “Dragon Slayers?” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “diamond jewelry certification services”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 25 of 149 diamond jewelry certification services based in the United Kingdom

See the full list, filter by size, metro and specialty, and access 333 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Diamond jewelry certification services based in the United Kingdom at a glance

As of Nov 6, 2026

29.2%Verified-email coverage

7.6Average contacts per company

1-10Median size (employees)

56.4%Largest-city concentration · London

Nov 6, 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 149 companies.

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies: Company records associated with the United Kingdom whose business descriptions match “diamond jewelry certification services” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch: Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview: The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality: RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 333 professional contacts with verified work emails across the full matched dataset. 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 November 6, 2026. Lists refresh periodically as the graph is re-checked.
Record context: Company records and descriptions can change. Check the company's website for its current services and locations.

Diamond jewelry certification services by metro

Diamond jewelry certification services in London84

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “diamond jewelry certification services”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many diamond jewelry certification services are there based in the United Kingdom?

RevenueBase identified 149 company matches for diamond jewelry certification services associated with the United Kingdom as of November 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

Jessica Mccormack tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city has the most diamond jewelry certification services?

London leads with 84 company records, followed by Birmingham (7) and Glasgow (4).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 333 professional contacts with verified work emails tracked across these 149 companies; direct dials are available where recorded.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on November 6, 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 SmartSearch, 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.