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GB/T 36169-2018: Turquoise -- Grading
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GB/T 36169-2018	English	359	Add to Cart	4 days [Need to translate]	Turquoise -- Grading

GB/T 36169-2018: Turquoise -- Grading

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(Turquoise Grading) ICS 39.060 D59 National Standards of People's Republic of China Turquoise grading Published on.2018-05-14 2018-12-01 implementation State market supervision and administration China National Standardization Administration issued

Content

Foreword I 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 Turquoise identification 2 5 color grading 2 6 texture classification 4 7 Surface cleanliness classification 5 8 Transparency Description 6 9 gloss description 6 10 pattern description 6 11 grading requirements 6 12 turquoise mass measurement 7 13 Turquoise Grading Certificate 7 Appendix A (informative) HSB color solid model 8 Appendix B (Normative) Turquoise Color Grading Reference Color Card 9 Appendix C (informative) Turquoise common cockroach type 11 Appendix D (informative) Turquoise surface cleanliness level 12 Appendix E (informative) Turquoise common special pattern type 13 Reference 14

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard was proposed by the Ministry of Natural Resources of the People's Republic of China This standard is under the jurisdiction of the National Jewelry and Jade Standardization Technical Committee (SAC/TC298). This standard was drafted. China University of Geosciences (Wuhan) Jewelry Institute, Zhushan County Turquoise Resources Administration, Zhushan Baoyuan Turquoise Mining limited liability company. The main drafters of this standard. Yang Xing, Lu Ren, Shen Xitian, Di Jingru, Yan Lizhu, Gong Juhai, Chen Jianping, Fang Xiaochun, Ren Chuxiong, Wang He, Wang Zhenglong, Liu Ling, He Wei, Wang Yamei, Jiang Linping, Xu Yang, Chen Quanli, Luo Zemin. Turquoise grading

1 Scope

This standard specifies the terms and definitions of natural or optimized unset polished turquoise, turquoise color, texture, surface cleanliness Level rules, turquoise transparency, gloss, pattern description, turquoise grading requirements, quality measurement and grading certificates. This standard applies to natural or optimized non-inlaid polished turquoise grades, inlaid polished turquoise can be used as reference.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article. Pieces. For undated references, the latest edition (including all amendments) applies to this document. GB/T 16552 Jewelry and Jade Name GB/T 16553 Jewelry and Jade Identification

3 Terms and definitions

The following terms and definitions as defined in GB/T 16552 and GB/T 16553 apply to this document. 3.1 Turquoise turquoise A cryptocrystalline mineral aggregate containing aqueous copper aluminum phosphate, the main chemical component CuAl6(PO4)4(OH)8·4H2O, may contain a small amount Kaolinite, quartz, pyrite, mica, mayenite, iron oxides and hydroxides. 3.2 Turquoise grading turquoisegrading Turquoise is graded according to three aspects. color, texture, and surfaceclarity. 3.3 Color grading colorgrading The coloration method is used to classify the turquoise color under specified conditions. 3.3.1 HSB color system HSBcolorsystem The hue system of the object color is represented by the hue, saturation and lightness specified by the HSB color solid model (see Appendix A). 3.3.2 Hue hue Indicates the color characteristics of turquoise blue, green, yellow, etc. The HSB color system is represented by the symbol H, on the hue circle, according to the angle value Logo. 3.3.3 Saturation saturation The vividness of the color of the turquoise surface. The HSB color system is represented by the symbol S, according to the proportion of pure color in the whole vision. Evaluation. ...