GB/T 16554-2017Diamond grading (English PDF)
钻石分级
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Issued by
General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of the PRC
Level / Type
National · Recommended
Issue date
October 14, 2017
Implementation date
May 1, 2018
Scope
GB/T 16554-2017 is the English-translated version of 钻石分级.
GB/T 16554-2017 is the Chinese standard "Diamond grading". Its scope clause reads: This standard specifies the terms and definitions of natural unpolished and inlaid polished diamonds, diamond color, clarity, cut rules, diamonds Quality and diamond grading certificate.
This standard applies to jewelery identification, cultural relics identification, commerce and trade, customs, insurance, pawn, asset evaluation and research teaching, literature publishing Diamond grading and related fields.
The color grading of this standard applies to unmounted and inlaid polished diamonds of the colorless to light yellow (brown, gray) color series. This standard in the classification for cut workers for the standard round diamond type is not mosaic and mosaic polished diamonds.
The grading rules in this standard apply to unmounted and inlaid polished diamonds that have not been optimally treated with a coating, crevice fill, etc. The classification rules of this standard apply to the quality of greater than or equal to 0.0400g (0.20ct) non-mosaic polished diamond, the quality of 0.0400g (0.20ct, inclusive) to 0.2000g (1.00ct, inclusive) inlaid polished diamond.
Quality is less than 0.0400g (0.20ct) Inlaid and inlaid polished diamonds, quality greater than 0.2000g (1.00ct) inlaid polished diamond may refer to the implementation of this standard.
Non-colorless to light yellow (brown, gray) series of non-mosaic and mosaic polishing diamonds, the clarity of grading can refer to the implementation of this standard; the standard round Drilling cut classification can refer to the implementation of this standard.
Non-standard round diamond cut and inlay mosaic inlaid polished diamonds, the color grading, clarity classification and cutting grading degree of modification (polishing And symmetry) grading may refer to the implementation of this standard. Its clauses include terms and definitions.
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Document preview — GB/T 16554-2017
National Standard of the People's Republic of China
- ICS
- 39.060
- Classification
- D 59
- Replacing
- GB/T 16554-2010
Issued by: General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of the PRC
Contents
- Preface
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 color grading
- 5 clarity rating
- 6 cut grade
- 7 the quality of the diamond
- Appendix A (informative) common diamond, the external characteristics of type
- Appendix B (Normative) Diamond Mosaic Rules
- Appendix C (Normative Annex) Rating Scale
- Appendix D (Informative) Diamond Recommended Carat Weight Table
1 Scope
This standard specifies the terms and definitions of natural unpolished and inlaid polished diamonds, diamond color, clarity, cut rules, diamonds
Quality and diamond grading certificate.
This standard applies to jewelery identification, cultural relics identification, commerce and trade, customs, insurance, pawn, asset evaluation and research teaching, literature publishing
Diamond grading and related fields.
The color grading of this standard applies to unmounted and inlaid polished diamonds of the colorless to light yellow (brown, gray) color series.
This standard in the classification for cut workers for the standard round diamond type is not mosaic and mosaic polished diamonds.
The grading rules in this standard apply to unmounted and inlaid polished diamonds that have not been optimally treated with a coating, crevice fill, etc.
The classification rules of this standard apply to the quality of greater than or equal to 0.0400g (0.20ct) non-mosaic polished diamond, the quality of
0.0400g (0.20ct, inclusive) to 0.2000g (1.00ct, inclusive) inlaid polished diamond. Quality is less than 0.0400g (0.20ct)
Inlaid and inlaid polished diamonds, quality greater than 0.2000g (1.00ct) inlaid polished diamond may refer to the implementation of this standard.
Non-colorless to light yellow (brown, gray) series of non-mosaic and mosaic polishing diamonds, the clarity of grading can refer to the implementation of this standard; the standard round
Drilling cut classification can refer to the implementation of this standard.
Non-standard round diamond cut and inlay mosaic inlaid polished diamonds, the color grading, clarity classification and cutting grading degree of modification (polishing
And symmetry) grading may refer to the implementation of this standard.
2 Normative references
The following documents for the application of this document is essential. For dated references, only the dated version applies to this article
Pieces. For undated references, the latest edition (including all amendments) applies to this document.
GB/T 16552 name of jewelry jade
GB/T 16553 jewelery identification
3 Terms and definitions
GB/T 16552, GB/T 16553 and defined by the following terms and definitions apply to this document.
3.1 Diamond
An equiaxed crystal natural mineral consisting of carbon atoms with a Mohs hardness of 10, a density of 3.52 (± 0.01) g/cm3, a refractive index of 2.417, a dispersion value
0.044.
3.2
The diamonds are graded in four respects, from color, clarity, cut and quality (carat 1), referred to as 4C
Grading.
1) The carat weight unit is still used in the diamond trade, 1.00ct = 0.2000g.
GB/T 16552 | GB/T 14506.30 | SN/T 0481.7 | GB/T 16553 | […]
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 64 pages — is available in the English PDF.
Referenced standards
Normative references
Cited by
- GB/T 45611-2025Diamond — Testing and classification
- GB/T 42221-2022Jewellery - Consumer confidence in the diamond industry
- GB/T 33541-2017Criteria for judging the conformity of sampling inspection for gem and precious metal products
- GB/T 34543-2017Yellow diamond grading
- GB 11887-2012Jewellery -- Fineness of precious metal alloys and designation [including MODIFICATION 1]
- SB/T 10653-2012Service standard of jewelry accessories business
Similar standards
Editions of GB/T 16554
| Edition | Title | Revision | Status |
|---|---|---|---|
| GB/T 16554-2017 | Diamond grading | third revision | Current |
| GB/T 16554-2010 | Diamond grading | second revision | Superseded |
| GB/T 16554-2003 | Diamond grading | first revision | Superseded |
| GB/T 16554-1996 | Diamond grading | first issue | Superseded |
This page sells the current edition, GB/T 16554-2017. Earlier editions are listed for reference only.
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