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GB 11887-2012: Jewellery -- Fineness of precious metal alloys and designation [including MODIFICATION 1] Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB 11887: Historical versions
Similar standardsGB 11887-2012: Jewellery -- Fineness of precious metal alloys and designation [including MODIFICATION 1]---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GB11887-2012 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 39. 060 Y 88 Replacing GB/T 11887-2008 Jewellery – Fineness of Precious Metal Alloys and Designation (ISO 9202.1991, Jewellery - Fineness of Precious Metal Alloys, MOD) Issued on: NOVEMBER 5, 2012 Implemented on: MAY 1, 2013 Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China; Standardization Administration of the People's Republic of China. Table of ContentsForeword ... 3 1 Scope ... 5 2 Normative References... 5 3 Terms and Definitions ... 6 4 Fineness Range ... 6 5 Marks of Jewellery Products ... 7 6 Determination Method ... 8 7 Designation Rules ... 8 Appendix A (Informative) Comparison of Chapters and Articles’ Numbers between This Standard and ISO 9202.1991 ... 9 Appendix B (Informative) Technical Differences between This Standard and ISO 9202.1991, and Reasons ... 10 No.1 Amendment of GB 11887-2012 ... 11ForewordChapters 4, 5 and 7 of this Standard are compulsory. The rest are recommendatory. This Standard is drafted in accordance with GB/T 1.1-2009. This Standard replaces GB 11887-2008 "Jewellery — Fineness of Precious Metal Alloys and Designation". Compared with GB 11887-2008, the main differences are as follows. — Introduction is deleted (Introduction of 2008 edition); — Amend the relevant recently-issued standards into the normative references (see Chapter 2); — Delete the specific requirements on harmful elements. It is revised as “shall meet the requirements of GB 28480” (see 4.3 of this edition, 4.3 of 2008 edition); — Delete the relevant contents of determination of harmful elements (see 6.2 of 2008 edition). Using re-drafting method, this Standard modifies and adopts ISO 9202.1991(E) "Jewellery — Fineness of Precious Metal Alloys". Compared with ISO 9202.1991, this Standard adjusts the structure significantly. Appendix A lists out the article-section comparison between this Standard and ISO 9202.1991. There are technical differences between ISO 9202.1991 and this Standard. The technical differences are marked with vertical single line on the page margin of the involved articles. Appendix B gives the list of these technical difference and their reasons. This Standard was proposed by the China National Light Industry Council. This Standard shall be under the jurisdiction of the National Technical Committee on Jewellery of Standardization Administration of China (SAC/TC 256). Drafting organization of this Standard. National Jewellery Quality Supervision and Inspection Centre. Chief drafting staffs of this Standard. Duan Tiyu, Li Suqing, Wang Chunsheng, Li Yukun, and Li Wujun. The previous editions replaced by this Standard are as follows. Jewellery – Fineness of Precious Metal Alloys and Designation1 ScopeThis Standard specifies the precious metals’ fineness range1), mark, test method, and the designation method of precious metal jewellery. This Standard is applicable to jewellery industry and the precious metal jewelleries that are produced and marketed in domestic market. For precious metal ornaments, it shall refer to this Standard.2 Normative ReferencesThe following referenced documents are indispensable for the application of this document. For dated references, only the edition cited apply. For undated references, the latest edition of the referenced document (including all corrigendum) apply. GB/T 9288 Gold Jewellery Alloys — Determination of Gold — Cupellation Method (Fire Assay) (GB/T 9288-2006, ISO 11426.1997, MOD) GB/T 16552 Gems — Nomenclature GB/T 16553 Gems — Testing GB/T 16554 Diamond Grading GB/T 17832 Silver Jewellery Alloys — Determination of Silver — Volumedtric (Potentionmetric) Method Using Potassium Bromide (GB/T 17832-2008, ISO 11427.1993, MOD) GB/T 18781 Cultured Pearl Grading GB/T 19720 Platinum Jewellery Alloys — Determination of Platinum and Palladium — Gravimetric Method after Precipitation of Diammonium Hexachloroplatinate and Dimethylglyoxime (GB/T 19720-2005, ISO 11210. 1995, MOD) GB/T 21198.6 Determination of Precious Metals in Precious Metals Jewellery Alloys — Method Using ICP Spectrometry — Part 6. Difference Method GB/T 23885 Jadeite Grading GB/T 28480 Adornment — Provision for Limit of Baneful Elements 1) It excludes welding powder. However, the content of the finished product (except accessories) must not be lower than the specified fineness range. (999) (Thousand-pure palladium, thousand-pure palladium gold) Silver and its alloy (999) (Pure silver) (Thousand-pure silver) Note 1. The values and representation which are not in brackets are preferable. Note 2. The theoretical fineness of 24K is 1000‰. 4.2 The material fineness of jewellery accessories shall be consistent with the jewellery main body. If it is needed by strength and elasticity, the accessory material shall conform to the following requirements. a) For gold jewellery of which the gold content is not lower than 916‰ (22K), the gold content of their accessories shall not be lower than 900‰. b) For platinum jewellery of which the platinum content is not lower than 950‰, the platinum content of their accessories shall not be lower than 900‰. c) For palladium jewellery of which the palladium content is not lower than 950‰, the palladium content of their accessories shall not be lower than 900‰. d) For pure silver and thousand-pure silver jewelleries, the silver content of their accessories shall not be lower than 925‰. 4.3 Precious metals and the elements contained in alloy jewelleries must not be harmful to human health. The contained harmful elements shall meet the requirements of GB 28480.5 Marks of Jewellery Products5.1 Marking 5.1.1 Content of marking The content of marking shall include. manufacturer code, material, fineness, and the mass of the main diamond (above 0.10 karat) for diamond-inlay jewellery. Example. jewellery of 18 K gold, 0.45 karat diamond-inlay, made by a certain company (manufacturer code. ABC) is marked as. ABC 18K Gold 0.45 ct D. 5.1.2 Representation of fineness and material marking 5.1.2.1 The main body is marked according to the specifications in Table 1. The accessories are marked according to the requirements in 4.2. 5.1.2.2 Gold jewellery. Combination of “thousand-fineness (K value)”, "Gold", "Au" or "G". For example. Gold 750 (18K Gold), Au750 (Au18K), G750 (G18K).Appendix A(Informative) Comparison of Chapters and Articles’ Numbers between This Standard and ISO 9202.1991 Table A.1 gives the comparison list of chapters and articles’ numbers between this Standard and ISO 9202.1991. Table A.1 Comparison List of Chapters and Articles’ Numbers between This Standard and ISO 9202.1991 Numbers of chapters and articles in this Standard Numbers of corresponding chapters and articles in the international Standard 2 — 3.1 2.1 3.2 — 4.1 3 4.2 — 4.3 — 5 — 7 — Note 1. The theoretical value of 24K is 1000 ‰. Note 2. "Pure (platinum, platinum, palladium, silver)" is the highest fineness of jewellery products specified in this standard; it means that the precious metal content is not less than 990 ‰. 4.2 The fineness of jewellery accessories shall be consistent with the main-body. Due to the needs of strength and elasticity, the accessory’s materials shall meet the following requirements. 4.2.1 For gold jewellery of which the gold content is not less than 916 ‰ (22K), the accessory’s gold content shall not be less than 900 ‰. 4.2.2 For platinum jewellery of which the gold content is not less than 950 ‰ (22K), the accessory’s platinum content shall not be less than 900 ‰. 4.2.3 For palladium jewellery of which the gold content is not less than 950 ‰ (22K), the accessory’s palladium content shall not be less than 900 ‰. 4.2.4 For pure silver jewellery, the accessory’s silver content shall not be less than 925 ‰. 4.3 The elements contained in precious metals and their alloys must not be harmful to human health. The contained elements shall meet the provisions of GB 28480. II. Chapter 7 is changed as. 7.1 Designation content of precious metal jewellery content can only include fineness, material, gem’s name and jewellery varieties. There must not have other content before or after the designation. Example 1. 18K Gold Ruby Ring Example 2. Pt900 Diamond Ring 7.2 The designation of precious metal’s material and fineness shall be based on the provisions of Table 1. 7.3 The designation of the precious metal’s jewellery shall be based on the provisions of QB/T 1689. 7.4 Inlaid gem’s identification and designation shall be in accordance with GB/T 16552, GB/T 16553, GB/T 16554, GB/T 18781, GB/T 23885. For the gem on ... ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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