Qualified judgement criteria of sampling inspection for gems and precious metal products
1 Scope
This standard specifies the requirements and methods for sampling, inspection, judgment and repeat test or inspection of gems and precious metal products during quality inspection.
This standard is applicable to the quality inspection of gems and precious metal products. For other types of gems and precious metal products, this standard can 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 2828.4-2008 Sampling procedures for inspection by attributes—Part 4: Procedures for assessment of declared quality levels
GB/T 2828.11 Sampling procedures for inspection by attributes—Part 11: Procedures for assessment of declared quality levels for small population
GB/T 9288 Gold jewellery alloys—Determination of gold—Cupellation method (fire assay)
GB 11887 Jewellery—Fineness of precious metal alloys and designation
GB/T 14459 Sampling inspection rules rules by attributes for precious metal adornment
GB/T 16306 Re-inspection and re-test procedures for assessment of declared quality levels
GB/T 16552 Gems—Nomenclature
GB/T 16553 Gems—Testing
GB/T 16554 Diamond grading
GB/T 17832 Silver jewellery alloys—Determination of silver—Volumetric (potentionmetric) method using potassium bromide
GB/T 18043 Jewellery—Determination of precious metal content—Method using X-Ray fluorescence spectrometry
GB/T 18781 Cultured pearl grading
GB/T 19719 Jewellery—Determination of the release of nickel—Method of spectrometry
GB/T 19720 Platinum jewellery alloys—Determination of platinum and palladium—Gravimetric method after precipitation of diammonium hexachloroplatinate and dimethylglyoxime
GB/T 21198.6 Determination of precious metals in precious metals jewellery alloys—Method using ICP spectrometry—Part 6: Difference method
GB/T 23885 Jadeite grading
GB/T 28019 Adornment—Determination of Chromium (Ⅵ)—1,5-Diphenylcarbohydrazide spectrophotometric method
GB/T 28020 Adornment—Determination of baneful elements—X-ray fluorescence spectrometric method
GB/T 28021 Adornment—Determination of baneful elements—Method of spectrometry
GB 28480 Adornment—Provision for limit of baneful elements
GB/T 28485 Coated adornment—Detection of nickel release—Method for simulation of wear and corrosion
GB/T 29155 Transparent jadeite (colorless) grading
GB/T 30712 Provision of permissible errors for measurement of polished diamond mass
GB/T 31912 Adornment—Mark
QB/T 1689 Terms of precious metal adornment
QB/T 1690 Provision of permissible errors for measurement of precious metals adornment mass
QB/T 2062 Precious metal adornment
QB/T 4189 Evaluation specifications of precious metal jewelry technological
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
audit population
all the audited unit products. The audit population size refers to the quantity of unit products in the audit population, expressed by the letter N
3.2
declared quality level
upper limit of the quantity (percent) of nonconforming products allowed in the audit population
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Sampling
5 Inspection items and requirements
6 Inspection method
7 Judgment
8 Repeat test or inspection
