A hallmark is an official mark or series of marks struck on items made of precious metal, mostly to certify the content of metals such as platinum, gold, silver and palladium. This guarantees the purity/fineness of the metal. Hallmarks are a legal requirement on products of a certain weight – depending on the metal being marked.
You can find out more about what each hallmark means using the Assay Office’s guide below. You can also download a full PDF version here.