Regulation on permissible errors for mass measurement of jewelry and precious metal product
1 Scope
This standard specifies the requirements, measurement methods and marking of permissible errors for mass measurement of jewelry and precious metal products.
This standard is applicable to the trade and mass inspection of jewelry and precious metal products.
This standard is applicable to single jewelry and precious metal product with mass less than or equal to 200.00 g. For the jewelry and precious metal products (with total mass less than or equal to 200.00 g) of the same kind that are settled in bulk, this standard may be used as a reference.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 26021 Gold bar
GB/T 30712 Provision of permissible errors for measurement of polished diamond mass
GB/T 31912 Adornment - Mark
JJG 1036 Electronic balance
QB/T 1690 Provision of permissible error for measurement of precious metal adornment mass
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 30712, GB/T 31912, JJG 1036 and the following apply.
3.1
jewelry and precious metal product
umbrella name of gem product and precious metal product, as well as product set with precious metal and gem
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Requirements
5 Measurement method
6 Marking
珠宝贵金属产品质量测量允差的规定
1 范围
本标准规定了珠宝贵金属产品的质量测量允差的要求、测量方法和标识。
本标准适用于珠宝贵金属产品的贸易和质量检验。
本标准适用于质量小于或等于200.00g的单件珠宝贵金属产品。总质量小于或等于200.00g的同类批量结算的珠宝贵金属产品，可参照本标准执行。
2 规范性引用文件
下列文件对于本文件的应用是必不可少的。凡是注日期的引用文件，仅注日期的版本适用于本文件。凡是不注日期的引用文件，其最新版本(包括所有的修改单)适用于本文件。
GB/T 26021 金条
GB/T 30712 抛光钻石质量测量允差的规定
GB/T 31912 饰品标识
JJG 1036 电子天平
QB/T 1690 贵金属饰品质量测量允差的规定
3 术语和定义
GB/T 30712、GB/T 31912、JJG 1036界定的以及下列术语和定义适用于本文件。
3.1
珠宝贵金属产品 jewelry and precious metal product
珠宝玉石产品、贵金属产品，贵金属与珠宝玉石镶嵌组成的产品的统称。
3.2
珠宝玉石产品 gem product
以珠宝玉石为原料，经过切磨雕琢等加工制作而成的产品。
3.3
贵金属产品 precious metal product
仅由贵金属或其合金制成的产品。
3.4
标注质量 marking mass
珠宝贵金属产品的标签标识、票据等所标注的质量，以克(g)为单位。
3.5
实测质量 actual measured mass
依据5.3.2测量所得到的珠宝贵金属产品的质量，以克(g)为单位。
3.6
质量测量允差 permissible errors for mass measurement
珠宝贵金属产品实测质量与标注质量之间所允许的偏差极限值。
4 要求
4.1 抛光钻石质量测量允差
应符合GB/T 30712的规定。
4.2 以质量作为结算依据的珠宝玉石产品(不含抛光钻石)质量测量允差
各质量范围的质量测量允差规定如下：
——当产品质量m≤1g时，质量测量允差为±0.002g(±0.01ct)。
——当产品质量在1g
