Provisions on permissible errors for measurement of mass of polished diamond
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.
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.
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
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
Provisions on permissible errors for measurement of mass of polished diamond
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.
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.
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
Contents of GB/T 30712-2014
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
