This listing is for a UK hallmark with the London Assay Office. If you purchase an item of jewellery from Bottlebee that is under the legal threshold for hallmarking, but would still like a hallmark on your purchase, please buy this listing . The hallmarking service is for a sterling silver hallmark or gold hallmark. Hallmarked jewellery is a legal requirement for items weighing over a certain threshold. Most items can be hallmarked to prove it's precious metal quality. Sterling items weighing over than 7.78g or gold items weighing over 1g require a hallmark. All marks are stamped by the London Goldsmiths' Company Assay Office A hallmark: - Consists of a series of marks applied to articles of the precious metals platinum, gold, palladium and silver - Means that the article has been independently tested - Guarantees that it conforms to all legal standards of purity (fineness) A complete hallmark consists of three compulsory punch marks: - Sponsor's (or maker's, manufacturer's or name) mark - Metal and fineness (purity) mark - Assay Office mark I also add two optional marks as standard: - Date mark - Traditional fineness mark Items are marked at the lowest precious metal. So if you purchase a silver and gold item, it will be hallmarked as silver. If you buy a silver and brass item, it will be hallmarked as silver + metal. Please note that it will take approximately two additional weeks for your item to be sent to you.