QB 1131-2005 in English

1 Scope

This standard specifies the terms and definitions, requirements, inspection methods and marks of gold coatings thickness.

This standard is applicable to jewelry products with non-gold base.

2 Normative references

The following documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections), or revisions, of any of these publications do not apply to this standard. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition applies.

GB/T 17722 Gold-plated thickness measurement by SEM
QB/T 1133 Jewellery - Determination of gold coatings - Method of Chemistry
QB/T 1135 Jewellery-Measurement of gold and silver coating thickness-X-ray fluorescence spectrometric methods

3 Terms and definitions

For the purpose of this standard, the following terms and definitions apply.

Jewellery with a gold alloy coating may be designated by the terms given in Table 1 only if the thickness of the coating is in accordance with the values indicated in this table.

Note: this coating requirement may also be defined by the fine gold content related to the total mass of the article. The fine gold content defined in this way is customarily indicated in the jewellery trade in “millième”. In this case, the conformity of the coating with the requirements has to be calculated using the mass of the article, the value expressed in millième, the surface area and the density of fine gold. However, to conform with this standard, the coating, defined in millième, has to be at least equivalent to the thickness indicated in Table 1.

Foreword I
1 Scope
2 Normative references
3 Terms and definitions
4 Requirements
5 Inspection method
6 Marking
Annex A (Informative) Numbering of the clauses in this standard corresponds to that in ISO 10713: 1992
Annex B (Informative) Technical differences between this standard and ISO 10713:1992 and their reasons