Stamping and Hallmarking your Metal Clay work

British hallmarksRules about hallmarking or stamping your work differ from country to country. Always check with the authorities in your country to find out how you should mark your precious metal work for sale. On this page you’ll find some resources to help you.

Hallmarking in the UK

The testing and marking of jewellery and silverware to guarantee the precious metal content of an article has been carried out by the Goldsmiths’ Company since 1300. The process is known today as hallmarking, which originally meant ‘marked at Goldsmiths’ Hall’. The techniques of sampling, testing (assaying) of the precious metal content (fineness) and marking have altered over the centuries, but the principle of providing a guarantee for manufacturers, importers, retailers, and the eventual purchaser, remains the same. It is one of the oldest forms of consumer protection.

The British Hallmarking Council

Nowadays hallmarking is carried out in the UK not only by the London Assay Office, at Goldsmiths Hall, but also by the Birmingham, Edinburgh and Sheffield Assay Offices. Visit these links to find out more about this in the UK.

London Assay Office

Birmingham Assay Office

Sheffield Assay Office

Edinburgh Assay Office



Guide for the Jewelry, Precious Metal and Pewter Industries

Federal Trade Commission guide.

Jewelers Vigilance Committee

The Jewelers Vigilance Committee was formed in 1912 to provide education and self-regulation to the jewelry industry. Members operate under the highest standards of business practice after pledging to comply with all laws applicable to the jewelry industry and make accurate representations about the products they sell.