The legal requirements of hallmarking The Hallmarking Act 1973 (HA 1973) controls the selling of items described as 'gold', 'silver', 'platinum' or 'palladium'. A hallmark is a series of marks applied to articles made of these precious metals, which indicates that the article has been independently tested at an Assay Office. It is a guarantee that the item conforms to the legal standards of precious metal content, known as 'fineness' (the ratio of precious metal to alloy in the article expressed in parts per thousand). Articles described as being wholly or partly made of gold, sliver, platinum or palladium must bear the appropriate hallmarks before they can be supplied or offered for supply. Subject to certain exceptions, unhallmarked articles cannot be described as being wholly or partly made of gold, silver, platinum or palladium. An approved explanatory hallmarking notice must be displayed for customers in premises where articles made of gold, sliver or platinum are made, supplied, sold or exchanged etc. Approved notices are issued by the British Hallmarking Council. When are hallmarks not required? Hallmarks