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GB/T 30712-2014Provision of permissible errors for measurement of polished diamond mass (English PDF)

抛光钻石质量测量允差的规定

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

March 27, 2014

Implementation date

October 1, 2014

Scope

GB/T 30712-2014 is the English-translated version of 抛光钻石质量测量允差的规定.

GB/T 30712-2014 is the Chinese standard "Provision of permissible errors for measurement of polished diamond mass". Its scope clause reads: This standard specifies the requirements, test method and marking for permissible errors for measurement of mass of polished diamond.

This standard is applicable to the trade and quality supervision of polished diamonds settled by mass.

This standard is applicable to single polished diamond with a mass greater than or equal to 0.0400 g (0.20 ct); for single polished diamond with a mass less than 0.0400 g (0.20 ct) or polished diamonds set in clusters or settled in bulk, this standard may be used as a reference.

Its clauses include terms and definitions; requirements for permissible errors for measurement.

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Document preview — GB/T 30712-2014

National Standard of the People's Republic of China

ICS: 39.060
Classification: D 59

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Requirements for permissible errors for measurement
5 Test method
6 Marking of mass

1 Scope

This standard specifies the requirements, test method and marking for permissible errors for measurement of mass of polished diamond.

This standard is applicable to the trade and quality supervision of polished diamonds settled by mass.

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 11887 Jewellery - Fineness of precious metal alloys and designation

GB/T 16554 Diamond grading

3 Terms and definitions

For the purposes of this document, the terms and definitions given in GB/T 16554 and the following apply.

3.1 marking mass of diamond

mass indicated on the mark or bill of polished diamond or ornament made of it, expressed in g

3.2 actual mass of diamond

mass of polished diamond measured in accordance with 5.2.2, expressed in g

3.3 permissible errors for measurement

deviation allowed between the actual mass and marking mass of the polished diamond

4 Requirements for permissible errors for measurement

......
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

Cited by

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