GB/T 42437-2023Nanhong—Testing (English PDF)
南红 鉴定
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
May 23, 2023
Implementation date
December 1, 2023
Scope
GB/T 42437-2023 is the English-translated version of 南红 鉴定.
GB/T 42437-2023 is the Chinese national method for identifying Nanhong, which clause 3 defines as a naturally occurring cryptocrystalline aggregate made mainly of alpha-quartz, coloured by hematite inclusions, red in main hue and slightly transparent to translucent.
Clause 4 gives the identification items, the identifying features - a mineral composition of alpha-quartz with hematite and possible minor goethite and calcite, and a chemical composition of mainly SiO2 with trace iron, aluminium, titanium and calcium - and the identification methods; clause 5 covers the enhancement treatments, filling and heat treatment among them, with how each is detected, and clause 6 the naming rules.
Three informative appendices give typical spectra and the measurement of the H610/H660 peak-to-peak and A501/A464 peak area ratios. It applies to Nanhong products and raw material. Issued on 23 May 2023, it has applied since 1 December 2023.
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Document preview — GB/T 42437-2023
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
Contents
- Preface
- 1 Scope
- 2 Normative references
- 3 Terms and Definitions
- 4 Identification
- 4.1 Identification items
- 4.2 Identification features
- 4.3 Identification method
- 5 Optimal treatment methods and their identification
- 5.1 Filling
- 5.2 Heat treatment
- 5.3 Other optimized treatment methods and their identification
- 6 Naming rules and representation methods
- Appendix A (Informative) Typical spectral characteristics of Nanhong
- Appendix B (informative) The measurement method of peak-to-peak ratio H610/H660
- Appendix C (informative) Schematic diagram of the measurement method of spectral peak area ratio A501/A464
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.
1 Scope
This document specifies the definition, identification items, identification characteristics, identification methods, optimized processing methods and identification of Nanhong, as well as naming rules. and representation methods, etc.
This document is applicable to the identification of Nanhong products and raw materials.
2 Normative references
The contents of the following documents constitute the essential provisions of this document through normative references in the text. Among them, dated references For documents, only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document.
GB 11887 Purity regulations and nomenclature of jewelry precious metals
GB/T 16552 Names of Jewelry and Jade
GB/T 16553 Identification of Jewelry and Jade
GB/T 31912 Jewelry Marking
GB/T 33541 Judgment criteria for sampling inspection of jewelry, jade and precious metal products
3 Terms and Definitions
GB/T 16552, GB/T 16553 and the following terms and definitions apply to this document.
3.1 Nanhong
Naturally produced, the color is caused by hematite mineral inclusions, the main color tone is red, slightly transparent-translucent, and mainly alpha-quartz Cryptocrystalline aggregates that make up minerals.
4 Identification
4.1 Identification items
The identification items and selection principles shall be carried out according to GB/T 16553.
4.2 Identification characteristics
4.2.1 Mineral composition
The main constituent minerals are alpha-quartz, including hematite. Some may contain a small amount of clinoptilite, goethite, calcite, etc.
4.2.2 Chemical composition
The main component is SiO2, which may contain trace elements iron (Fe), aluminum (Al), titanium (Ti), calcium (Ca) and so on.
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
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Related Standards
GB 11887-2012 — Jewellery -- Fineness of precious metal alloys and designation [including MODIFICATION 1]
GB/T 16552-2017 — Gems - Nomenclature
GB/T 16553-2017 — Gems - Testing
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