A mark of excellence since 1300. Your guarantee of first class service.

Welcome to the Goldsmiths' Company Assay Office. If you are looking for hallmarking services of the very highest quality, you have come to the right place. We believe no one else has more to offer your business in terms of expertise, efficiency, and understanding of your needs.

Above all, it's our history that enables us to say that with such confidence. Our Assay Office is where hallmarking began. As part of the Goldsmiths' Company, we have been testing the quality of gold and silver here in London for nearly 700 years (and, more recently, platinum and palladium). Over the centuries, we have acquired a unique position within the jewellery supply chain; constantly in close dialogue with the trade, and always at the leading edge in terms of technology and innovation.

Based upon our vast experience, we have also developed a range of other services designed to help give your business a competitive advantage. From valuations, through to technical training courses, to laboratory testing and analysis, the Assay Office is here to provide the highest levels of expertise, in the form you need it. To start taking advantage of the unmatched speed and flexibility of our hallmarking services - including a one-hour turn-around - you need to register your sponsor's mark with us. It will only take you a few minutes, so why not register now?