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See Chinese contents: GB 11887-2012 GB 11887-2012: Jewellery -- Fineness of precious metal alloys and designation [including MODIFICATION 1]
This Standard specifies fineness range 1) of noble metals in jewellery, mark for jewellery, test method and designation method for precious metal jewellery. This Standard is applicable to jewelleries produced and distributed in jewellery industry and at home (China).
