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GB 11887-2012Jewellery -- Fineness of precious metal alloys and designation [including MODIFICATION 1] (English PDF)

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Issued by

AQSIQ; SAC

Level / Type

National · Mandatory

Issue date

November 5, 2012

Implementation date

May 1, 2013

Scope

GB 11887-2012 (Jewellery -- Fineness of precious metal alloys and designation [including MODIFICATION 1]) is available as an English-translated PDF.

GB 11887-2012 — This 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.

Document preview — GB 11887-2012

National Standard of the People's Republic of China

Issued by: AQSIQ; SAC

Foreword...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

Foreword

Chapters 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 Designation

1 Scope

This 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 References

The 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 per mille.

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 per mille (22K),

the gold content of their accessories shall not be lower than 900 per mille.

b) For platinum jewellery of which the platinum content is not lower than 950 per mille,

the platinum content of their accessories shall not be lower than 900 per mille.

c) For palladium jewellery of which the palladium content is not lower than

950 per mille, the palladium content of their accessories shall not be lower than

900 per mille.

d) For pure silver and thousand-pure silver jewelleries, the silver content of their

accessories shall not be lower than 925 per mille.

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 Products

5.1 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 per mille.

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 per mille.

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 per mille (22K),

the accessory's gold content shall not be less than 900 per mille.

4.2.2 For platinum jewellery of which the gold content is not less than 950 per mille

(22K), the accessory's platinum content shall not be less than 900 per mille.

4.2.3 For palladium jewellery of which the gold content is not less than 950 per mille

(22K), the accessory's palladium content shall not be less than 900 per mille.

4.2.4 For pure silver jewellery, the accessory's silver content shall not be less

than 925 per mille.

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...

......

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

Referenced standards

Normative references

GB/T 9288 · GB/T 9288-2006 · ISO 11426.1997 · GB/T 17832 · ISO 11427.1993 · GB/T 19720 · ISO 11210 · GB/T 21198.6 · GB/T 28480

Cited by

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