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
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Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Requirements
5 Measurement method
6 Marking
珠寶貴金屬產品質量測量允差的規定
1 范圍
本標準規定了珠寶貴金屬產品的質量測量允差的要求、測量方法和標識。
本標準適用于珠寶貴金屬產品的貿易和質量檢驗。
本標準適用于質量小于或等于200.00g的單件珠寶貴金屬產品。總質量小于或等于200.00g的同類批量結算的珠寶貴金屬產品，可參照本標準執行。
2 規范性引用文件
下列文件對于本文件的應用是必不可少的。凡是注日期的引用文件，僅注日期的版本適用于本文件。凡是不注日期的引用文件，其最新版本(包括所有的修改單)適用于本文件。
GB/T 26021 金條
GB/T 30712 拋光鉆石質量測量允差的規定
GB/T 31912 飾品標識
JJG 1036 電子天平
QB/T 1690 貴金屬飾品質量測量允差的規定
3 術語和定義
GB/T 30712、GB/T 31912、JJG 1036界定的以及下列術語和定義適用于本文件。
3.1
珠寶貴金屬產品 jewelry and precious metal product
珠寶玉石產品、貴金屬產品，貴金屬與珠寶玉石鑲嵌組成的產品的統稱。
3.2
珠寶玉石產品 gem product
以珠寶玉石為原料，經過切磨雕琢等加工制作而成的產品。
3.3
貴金屬產品 precious metal product
僅由貴金屬或其合金制成的產品。
3.4
標注質量 marking mass
珠寶貴金屬產品的標簽標識、票據等所標注的質量，以克(g)為單位。
3.5
實測質量 actual measured mass
依據5.3.2測量所得到的珠寶貴金屬產品的質量，以克(g)為單位。
3.6
質量測量允差 permissible errors for mass measurement
珠寶貴金屬產品實測質量與標注質量之間所允許的偏差極限值。
4 要求
4.1 拋光鉆石質量測量允差
應符合GB/T 30712的規定。
4.2 以質量作為結算依據的珠寶玉石產品(不含拋光鉆石)質量測量允差
各質量范圍的質量測量允差規定如下：
——當產品質量m≤1g時，質量測量允差為±0.002g(±0.01ct)。
——當產品質量在1g
