The Assay Office


The Goldsmiths’ Company Assay Office is where hallmarking began, and we have been testing and hallmarking precious metals for over 700 years. 


Our reputation for excellence in hallmarking, service, and support is both revered and unparalleled.

Visit our dedicated website to complete your hallnote onlineregister for a sponsor's mark, or discover our other services, including lab services.

In addition to our Goldsmiths’ Hall headquarters, we operate at a range of different sites, each situated to make life as convenient as possible for our customers. These include premises at Greville Street, in the centre of the Hatton Garden jewellery quarter and at Heathrow Airport, which provides a premium fully insured door-to door service for imported goods.

We also have a dedicated facility on the premises of the manufacturer Allied Gold based in Dalston, North London, as well as at the workshop of luxury jewellery retailer Graff Diamonds in Mayfair. 

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The Assay Office

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