The London Assay Office
The Goldsmiths’ Company London Assay Office is the place where hallmarking began. For more than 700 years, it has protected consumers by guaranteeing the purity of precious metals.
Based at the home of hallmarking, Goldsmiths’ Hall, The London Assay Office tests the quality of items made of gold, silver, platinum, and palladium. It holds more than 10,000 active Sponsors Marks, and hallmarks approximately 3 million precious metal items a year.
The London Assay Office plays a pivotal role in the in The Trial of the Pyx, by scientifically analysing coins submitted by The Royal Mint, for purity, weight and size. This ensures that each one meets a strict set of standards designed to protect consumers.