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GB/T 16554-2017 English PDF

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GB/T 16554-2017: Diamond grading
Status: Valid

GB/T 16554: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
GB/T 16554-2017English468 Add to Cart 2 days [Need to translate] Diamond grading Valid GB/T 16554-2017
GB/T 16554-2010EnglishRFQ ASK 6 days [Need to translate] Diamond grading Obsolete GB/T 16554-2010
GB/T 16554-2003English599 Add to Cart 4 days [Need to translate] Diamond -- Grading Obsolete GB/T 16554-2003
GB/T 16554-1996English599 Add to Cart 4 days [Need to translate] Diamond Grading Obsolete GB/T 16554-1996

PDF similar to GB/T 16554-2017


Standard similar to GB/T 16554-2017

GB/T 16552   GB/T 5195.12   SN/T 0481.7   GB/T 16553   

Basic data

Standard ID GB/T 16554-2017 (GB/T16554-2017)
Description (Translated English) Diamond grading
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard D59
Classification of International Standard 39.060
Word Count Estimation 38,324
Date of Issue 2017-10-14
Date of Implementation 2018-05-01
Issuing agency(ies) General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China

GB/T 16554-2017: Diamond grading

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Diamond grading ICS 39.060 D59 National Standards of People's Republic of China Replacing GB/T 16554-2010 Diamond grading 2017-10-14 Published 2018-05-01 implementation General Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China China National Standardization Administration released Directory Preface Ⅰ 1 Scope 1 2 Normative references 1 3 Terms and definitions 1 4 color grading 9 5 clarity rating 11 6 cut grade 12 7 the quality of the diamond 17 Diamond Grading Certificate Appendix A (informative) common diamond, the external characteristics of type 18 Appendix B (Normative) Diamond Mosaic Rules 20 Appendix C (Normative Annex) Rating Scale 21 Appendix D (Informative) Diamond Recommended Carat Weight Table 33

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard replaces GB/T 16554-2010 "Diamond Grading." This standard compared with GB/T 16554-2010, the main changes as follows. --- Modify the table width ratio, crown-height ratio, overweight ratio, and other terms of the English equivalent (see 3.5.6.1-3.5.6.8, 3..5.16.10,.2010 Editions 3.5.16.1 ~ 3.5.16.8, 3.5.17.6). --- Increased waist circumference is not round, table eccentric, the top eccentric, table/bottom deviation, uneven crown, uneven crown angle, kiosk uneven depth, booth angle Average, uneven thickness, uneven width of the terms and definitions (see 3.5.17.1.1 ~ 3.5.17.1.10). --- Remove the "lizard skin" effect terms and definitions (see.2010 version 3.5.17.7). --- Added fluorescent color (see 4.2.3). --- Modify the division rules of clarity level SI2 (see 5.2.4,.2010 edition 5.2.4.2). --- Added symmetry measurement items (see 6.1.5). --- Modify the classification rules for overweight impact ratio levels (see 6.2.2.3.1.2,.2010 edition 6.2.3.1.2). --- Modify the symmetry rating (see 6.3.2,.2010 version 6.3.1). --- Revised quality weighing (see 7.2,.2010 version 7.2). --- Appendix A Table A.1 increased breaking, etching tube, crystal junction, twin net, modify the hollow instructions (see Appendix A). --- Appendix A Table A.2 increased stick burn marks, "lizard skin" effect, modified burn marks (see Appendix A). --- Adjust the Appendix C Table C.5 ~ C.14 Pavilion depth ratio of some of the parameters (see Appendix C). --- Appendix D Table D.1, an increase of the average diameter of 9.5mm ~ 11.0mm recommended carat weight (see Appendix D Table D.1). Please note that some of this document may be patentable. The issuing agencies of this document do not bear the responsibility of identifying these patents. This standard proposed by the Ministry of Land and Resources. This standard by the National Gems Standardization Technical Committee (SAC/TC298) centralized. This standard was drafted unit. National jewelery quality supervision and inspection center. The main drafters of this standard. Zhang Beili, Ke Jie, Shen Meidong, Tian Jing, Guo Tao, Lan Yan, Zhang Jun, Xie Jun, Lv Xiaomin, Wang Weiwei, Zhu Xiaoxia. This standard replaces the standards previously issued version. --- GB/T 16554-1996, GB/T 16554-2003, GB/T 16554-2010. Diamond grading

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.

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