Hallmarking. What is it and why do it? To be sold as Silver or any other precious metal, all finished items must undergo tests carried out by the assay office. There are four Assay offices in the UK (London, Birmingham, Sheffield and Edinburgh) and each undertakes tests to ascertain the precise metal content of the items delivered to it to ensure they comply with the law. The Sterling Silver standard requires all of the metal making up an item to contain 925 parts pure Silver to the 1000…