GB/T 31912-2015 Adornment—Mark

GB/T 8170-1987 Rules for rounding off of numberical values GB/T 8170-2008 Rules of rounding off for numerical values & expression and judgement of limiting values GB/T 11887-2000 Jewellery－Fineness of precious metal alloys and designation GB 11887-2002 Jewellery—Fineness of precious metal alloys and designation GB 11887-2008 Jewellery—Fineness of precious metal alloys and designation GB 11887-2012 Jewellery—Fineness of precious metal alloys and designation GB/T 16552-2003 Gems—Nomenclature GB/T 16552-2010 Gems—Nomenclature GB/T 16552-2017 Gems—Nomenclature GB/T 16554-2003 Diamond grading GB/T 16554-2010 Diamond grading GB/T 16554-2017 Diamond grading QB/T 1131-2005 QB/T 1131-2005 Specifications for the thickness of gold coating on jewelry QB/T 1132-2005 The specification for the thickness of silver coating on jewelry QB/T 1689-2021 Precious metal jewelry terms QB/T 1689-2006 QB/T 1689-2006 Precious metal jewelry terms QB/T 1690-2021 The regulations on the allowable tolerance for the measurement of precious metal jewelry quality QB/T 1690-2004 The regulations on the allowable tolerance for the measurement of precious metal jewelry quality QB 1131-1991 The thickness of gold covering layer for jewelry is specified QB 1132-1991 The thickness of silver plating on jewelry is specified QB/T 1689-1993 QB/T 2997-2008 Adornment with precious metal coating