GB/T 45611-2025 English PDF

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GB/T 45611-2025: Diamond - Testing and classification
Status: Valid

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GB/T 16552   GB/T 5195.12   SN/T 0481.7   GB/T 44913   GB/T 44910   

Basic data

Standard ID: GB/T 45611-2025 (GB/T45611-2025)
Description (Translated English): Diamond - Testing and classification
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: D59
Classification of International Standard: 39.060
Word Count Estimation: 62,674
Date of Issue: 2025-04-25
Date of Implementation: 2025-08-01
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 45611-2025: Diamond - Testing and classification

---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.
ICS 39.060 CCSD59 National Standard of the People's Republic of China Diamond Identification and Classification Released on 2025-04-25 2025-08-01 Implementation State Administration for Market Regulation The National Standardization Administration issued

Table of contents

Preface III 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 Categories 3 5 Identification 4 6 Common treatment methods and identification 9 7 Naming rules and representation methods 14 Appendix A (Informative) Common Defects in Diamonds and Their Characteristics 15 Appendix B (Informative) UV-Vis Absorption Spectrum 17 Appendix C (Informative) Infrared Absorption Spectrum 30 Appendix D (Informative) Photoluminescence Spectra 39 Appendix E (Informative) Luminous Image 47 Appendix F (Informative) Magnification Inspection 53 Appendix G (Informative) Raman Spectroscopy 55 References 56

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents" Drafting. Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents. This document is proposed by the Ministry of Natural Resources of the People's Republic of China. This document is under the jurisdiction of the National Technical Committee on Jewelry and Gemstone Standardization (SAC/TC298). This document was drafted by. National Gemstone Inspection Group Co., Ltd., Shandong Institute of Metrology, Anhui Geological Experiment Institute (Ministry of Land and Resources Hefei Mineral Resources Supervision and Inspection Center), National Jewelry Testing Center (Guangdong) Co., Ltd., National Inspection Center Shenzhen Shenzhen Jewelry Inspection Laboratory Co., Ltd., National Jewelry and Jade Quality Supervision and Inspection Center Laboratory Co., Ltd., Jewelry and Jade National Inspection Group (Shanghai) Co., Ltd., National Jewelry and Jade Quality Supervision and Inspection Center Laboratory Co., Ltd. Shenyang Branch, Yunnan National Inspection Jewelry Inspection Laboratory Co., Ltd., South China Jewelry Testing Laboratory (Foshan) Co., Ltd., Shandong Province Metrology and Testing Center, Shandong Province Social Justice Metrology Co., Ltd. Limited company. The main drafters of this document are. Song Zhonghua, Li Jianjun, Dai Hui, Su Jun, Gao Bo, Li Yujie, Yin Yidan, Cao Suqiao, Yu Lu, Zhu Wenfang, Wang Yang, He Shengmei, Ke Jie, Zhang Jun, Cheng Youfa, Li Haibo, Zhang Xiaoyu, Guo Lina, Zhong Yuanyuan, Liu Meiying, Sun Zhulin, Bai Qing, Li Meng, Zhu Xiaoxia, Liu Haibin, Zhu Hongwei, Wang Lei, Wang Yue, Ding Xiuyun, Li Hejun, Yan Fei, and Du Ran. Diamond Identification and Classification

1 Scope

This document provides the classification and identification of diamonds and describes the naming rules and representation methods of diamonds. This document applies to the identification and classification of diamonds, synthetic diamonds, and commonly treated diamonds.

2 Normative references

The contents of the following documents constitute essential clauses of this document through normative references in this document. For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to This document. GB/T 16552 Names of Jewellery and Jade GB/T 16553 Jewelry and Jade Identification GB/T 16554 Diamond Grading

3 Terms and definitions

The terms and definitions defined in GB/T 16552, GB/T 16553 and GB/T 16554 and the following apply to this document. 3.1 Diamond Natural diamondnaturaldiamond It is mainly composed of carbon atoms, with a Mohs hardness of 10 and a density of 3.52 (± 0.01) g/cm3.It has four groups of {111} moderate to complete solutions. It is an equiaxed natural mineral crystal with a refractive index of 2.417 and a dispersion value of 0.044 and a diamond luster. 3.2 synthetic diamond; laboratory-grown diamond Cultured Diamonds Man-made in whole or in part, with basically the same elemental composition and crystal structure as diamond, and similar physical and chemical properties Similar or identical gemstones. Note 1.Common synthesis methods include high temperature and high pressure (HPHT) and chemical vapor deposition (CVD). Note 2.A thin layer of material artificially grown on the surface of a diamond with basically the same elemental composition and crystal structure as diamond is also considered a synthetic diamond. 3.3 Zero phononline; ZPL It has the characteristics of symmetry between absorption spectrum and luminescence spectrum, and the transition from the lowest vibration energy level of the ground state to the lowest energy level of the excited state. Note. The zero phonon line is a characteristic parameter for identifying crystal defects. 3.4 Defect The phenomenon that the arrangement of particles in a local area of the ideal crystal structure of diamond deviates from its lattice structure. Note. Common defects in diamonds and their characteristics are shown in Appendix A. ......

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