The Goldsmiths' Company Assay Office is where hallmarking began over 700 years ago. We are experts in hallmarking as well as laser marking, valuations, punch making and laboratory services. As one of the twelve Great Livery Companies of the City of London, we have been responsible since 1300 for hallmarking and testing the quality of gold, silver, from 1975 platinum articles and from 2010 palladium articles. Goldsmiths' Hall, London | www.assayofficelondon.co.uk