Hallmarking is required by English Law (Hallmarking Act 1973) to guarantee the fineness of precious metals above specific weight thresholds. Most of the jewellery I create is sterling silver. Any pieces with a total metal weight of over 7.78g will be Hallmarked by The London Assay Office - and the product listing will notify you of this. The majority of my pieces are below this weight and do not require a hallmark, however, i am still require to display the Dealer's Notice..
The hallmark consists of three compulsary marks:
The Sponsor's mark - this is often the maker's initials surrounded by a shape.
The Fineness Mark - for sterling silver this is '925'
The Assay Office mark - for London this is a Lion's head.
Optional marks can also be added for:
Traditional Fineness symbols.
Common Control mark (CCM)