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Hallmark
A hallmark is an official marking made by a trusted party, 'guardians of the craft' or nowadays by an assay office, on items made of precious metals (platinum, gold and silver) that guarantees a certain purity of the metal. This should not be confused with a marking, often just a number such as 925, which is done voluntarily by the manufacturer, and unfortunately does not always reflect the true purity of the metal.
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