Making Hallmarking History

Celebrating 250 years of protection the consumer.

Proud member of the
Responsible Jewellery Council

Because responsible business
is good business.

Diamond Verification Services

The specialists in authenticating natural diamonds.

A range of Analytical Services

Precious metals have been analysed and hallmarked for well over 200 years...

Experts in Hallmarking

The oldest form of consumer protection, the history of the hallmark dates back as far as 1300...

Lifetime Achievement Award

A special award presented to our Assay Master / CEO, Mr Ashley Carson, for dedicating his life to the UK jewellery industry.



In an age where consumer protection and rights are a key concern for most present-day manufacturers it is fascinating to note that the hallmark is, in fact, one of the oldest forms of consumer protection that exists. The history of the hallmark dates back as far as 1300.

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Analytical Services

Analytical Services

We offer a range of additional analytical services from metal and mineral analysis, to mercury screening and environmental testing. Sheffield Assay Office was the first UK Assay Office to be awarded UKAS accreditation and is proud to have retained that accreditation for 32 years.

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Diamond Verification
Services (DVS)

Diamond Verification Services (DVS)

As the number of lab-grown diamonds in the market continues to soar, we recognised an urgent need for retailers, and consumers alike, to have access to a fully independent, specialist service that can accurately identify the presence of natural or lab-grown/synthetic diamonds.

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