GB/T 36128-2018Regulation of mass measurement permissible errors for jewelry and precious metal products (English PDF)
珠宝贵金属产品质量测量允差的规定
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
May 14, 2018
Implementation date
December 1, 2018
Scope
GB/T 36128-2018 is the English-translated version of 珠宝贵金属产品质量测量允差的规定.
GB/T 36128-2018 fixes the permissible errors allowed when jewelry and precious metal products are weighed for trade. It applies to single pieces of up to 200.00 g and can be referred to for batch settlement of products of the same kind totalling up to 200.00 g.
For jewelry settled by mass, the permissible error is ± 0.002 g up to 1 g, ± 0.004 g up to 10 g and ± 0.01 g up to 200 g. Precious metal adornments follow QB/T 1690, gold bars of not more than 200 g have a permissible error of + 0.01 g, and set precious metal jewelry ± 0.01 g.
It also covers measurement conditions, balance selection and marking. It was issued on 14 May 2018 and has applied since 1 December 2018.
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Document preview — GB/T 36128-2018
National Standard of the People's Republic of China
- ICS
- 39.060
- Classification
- Y 88
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword3
- 1 Scope4
- 2 Normative references4
- 3 Terms and definitions4
- 4 Requirements5
- 5 Measurement method6
- 6 Marking8
1 Scope
This Standard specifies the requirements, measurement method and marking for the mass measurement permissible errors of jewelry and precious metal products.
This Standard applies to the trade and mass measurement of jewelry and precious metal products.
This Standard applies to single pieces of jewelry and precious metal products whose mass is less than or equal to 200.00 g. This Standard can be referred to jewelry and precious metal products of the same kind for a batch settlement whose total mass is less than or equal to 200.00 g.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition dated applies to this document. For undated references, the latest edition of the referenced documents (including all amendments) applies to this document.
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, Verification regulation for electronic balance
QB/T 1690, Provision of permissible errors for measurement of precious metals adornment mass
3 Terms and definitions
For the purposes of this document, the following terms and definitions and those given in GB/T 30712, GB/T 31912 and JJG 1036, apply.
4 Requirements
4.2
The provisions of permissible errors for mass measurement for all mass ranges are as follows.
-- when the product mass is m <= 1 g, the permissible error for mass measurement is ± 0.002 g (± 0.01 ct);
-- when the product mass is 1 g < m <= 10 g, the permissible error for mass measurement is ± 0.004 g (± 0.02 ct);
-- when the product mass is 10 < m <= 200 g, the permissible error for mass measurement is ± 0.01 g.
4.3 Permissible errors for mass measurement of precious metal products
4.3.1 Precious metal adornment shall be as specified in QB/T 1690.
4.3.2 The mass permissible error for gold bars with the mass not greater than 200 g is + 0.01 g (except the positive permissible errors agreed by manufacturer and dealer).
4.4 Permissible errors for mass measurement for precious metal setting jewelry products for which mass is used as the settlement basis
4.4.1 The permissible error for mass measurement is ± 0.01 g.
4.4.2 Wherever diamond mass and precious metal mass are marked separately, they shall be as specified in 4.1 and 4.3 respectively.
4.4.3 Wherever jewelry mass and precious metal mass are marked separately, they shall be as specified in 4.2 and 4.3.
5 Measurement method
5.1 Measurement conditions
5.1.1 The environment for the use of balance shall meet the metrological requirements.
5.1.2 The balance used shall be approved in calibration within a calibration period.
5.1.3 During use, first carry out the metrological performance inspection and then operate as specified in the regulations.
5.2 Balance selection
5.2.1 The balance weighing polished diamonds shall be as required in GB/T 30712. […]
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
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Related Standards
GB/T 26021-2010 — Gold bar
GB/T 30712-2014 — Provision of permissible errors for measurement of polished diamond mass
GB/T 31912-2015 — Adornment—Mark
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