More than 245 years in business

Providing a number of services from Hallmarking, Laser Etching and Mark Identification...

Experts in Hallmarking

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

A range of Analytical Services

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

Assay Master's Latest Statement re Coronavirus Restrictions

I would like to wish all our customers a Happy New Year. We opened on Monday 4th January and by that evening we found ourselves in total lockdown again for at least the next 6 weeks.

Sheffield Assay Office will however continue to remain open and we will endeavour to operate our normal service wherever possible.

Opening Hours: Monday - Friday 08:30 - 16:30

Customer Counter for Collections and Deliveries
08:30 - 16:30 - Hallmarking
08:30 - 15:30 - Analytical Services

Our Courier Service operated in partnership with Regency Shipping will also continue and despatch will be on the evenings of Monday, Wednesday and Thursday. Please continue to book a collection by your usual method.

Early Hall This service will remain in place and will qualify for Same Day Service.

Please note our new Hallmarking Pricelist from 1st January 2021, Download PDF

I wish you all good health in these continued challenging times and if there is anything further that you wish to enquire about please contact us on and please check back here for any further announcements.

Ashley Carson
Assay Master & CEO

Hallmarking »


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 1300.

» More about Hallmarking

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.

» More about Analytical Services