Partners save 15% on every standard

Valid

GB/T 45611-2025Diamond — Testing and classification (English PDF)

钻石鉴定与分类

Open the GB/T 45611-2025 preview as PDF

Preview — first pages of GB/T 45611-2025 (full document: 51 pages)

This is a limited preview

Buy now to download the full PDF (51 pages)

Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

April 25, 2025

Implementation date

August 1, 2025

Scope

GB/T 45611-2025 is the English-translated version of 钻石鉴定与分类.

GB/T 45611-2025 is the Chinese national standard covering telling a natural diamond from one grown in a laboratory by HPHT or CVD, and both from a treated stone — the categories, the identification by magnification, luminescence imaging, ultraviolet-visible, infrared, photoluminescence and Raman spectra, the defects and zero phonon lines those spectra reveal, the common treatments and how each is recognised, and the naming rules that decide what may be written on the report. A laboratory-grown stone is the same carbon as a mined one, and only the growth defects give it away. First edition, under the Ministry of Natural Resources. In force from 1 August 2025. Issued on 25 April 2025, it has been in force since 1 August 2025.

Document preview — GB/T 45611-2025

National Standard of the People's Republic of China

ICS: 39.060
Classification: D 59

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

PrefaceIII
1 Scope1
2 Normative references1
3 Terms and Definitions1
4 Categories3
5 Identification4
6 Common treatment methods and identification9
7 Naming rules and representation methods14
Appendix A (Informative) Common Defects in Diamonds and Their Characteristics15
Appendix B (Informative) UV-Vis Absorption Spectrum17
Appendix C (Informative) Infrared Absorption Spectrum30
Appendix D (Informative) Photoluminescence Spectra39
Appendix E (Informative) Luminous Image47
Appendix F (Informative) Magnification Inspection53
Appendix G (Informative) Raman Spectroscopy55
References56

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

GB/T 16552

GB/T 16553

GB/T 16554

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.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 51 pages — is available in the English PDF.

Referenced standards

Normative references

Editions of GB/T 45611

Edition	Title	Revision	Status
GB/T 45611-2025	Diamond - Testing and classification	current edition	Current

This page sells the current edition, GB/T 45611-2025. Earlier editions are listed for reference only.

How to Buy GB/T 45611-2025

1Add to cart. Click the "Buy GB/T 45611-2025" button on this page. You can add more standards before checkout.
2Checkout. Enter your email and billing details. Payment is processed securely by Stripe (cards, Apple Pay, Google Pay supported).
3Instant delivery (0–9 sec). Delivery is automatic: within seconds of payment you'll receive an email with a secure download link. The link stays valid for 72 hours.
4Invoice included. A tax invoice is attached to the confirmation email. Need a custom invoice? Contact us.