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hallmark
A hallmark is an official mark or series of marks struck on items made of precious metals—platinum, gold, silver and in some nations, palladium. In a more general sense, the term ''hallmark'' can also be used to refer to any distinguishing characteristic or trait.
==General overview==
Historically, hallmarks were applied by a trusted party: the 'guardians of the craft' or nowadays by an assay office. Hallmarks are a guarantee of certain purity or fineness of the metal as determined by formal metal (assay) testing.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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