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ISO 9202:1991 Jewellery -- Fineness of precious metal alloys
standard by International Organization for Standardization, 09/01/1991
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Specifies a range of fineness of gold alloys (375, 585, 750, 916), platinum alloys (850, 900, 950), palladium alloys (500, 950), and silver alloys (800, 835, 925).