The key requirements of the Hallmarking Act are that:
- It is illegal for any trader to sell or describe a precious metal article as gold, silver, platinum or palladium in the UK unless it has been hallmarked by an independent UK Assay Office or another Assay Office outside the UK which has equivalent marks. The only exceptions are lightweight items which are below certain exemption weights.
- The UK Hallmarking regime is a third party independent system guaranteeing the fineness of a precious metal article.
- In the UK Hallmarks can only be applied by one of the four Assay Offices, as cited in the Hallmarking Act. Each of the Assay Offices has their own mark as shown here.