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range
This standard specifies the purity range of precious metals in jewelry, the identification and determination methods of jewelry products and the naming method of precious metal jewelry.
This standard is applicable to jewelry industry and jewelry produced and sold in China.
1) Note: flux components are not included, but the total content of finished products (except auxiliary materials) shall not be lower than the specified purity range.
2
Normative citation document
The clauses in the following documents become the clauses of this standard by reference. All subsequent modifications (excluding errata) or revisions of dated reference documents are not applicable to this standard. However, parties who have reached an agreement according to this standard are encouraged to study whether the latest versions of these documents can be used. For undated reference documents, the latest edition is applicable to this standard.
GB/T
9288
Gold alloy jewelry
Determination of gold content
Soot blowing method (fire assay) (GB/T9288-2006, ISO
1 1426: 1997
，MOD)
GB/T
16552
Jewellery jade
name
GB/T
16553
Jewellery jade
authenticate
GB/T
16554
Diamond grading
GB/T
1878 1
Classification of cultured pearls
GB/T
17832
Silver alloy jewelry
Determination of silver content
Potassium bromide volumetric method (potentiometric titration) (GB/T 17832-2008, ISO11427:1993, MOD)
GB/T 197 19
gemstone
Determination of nickel release
Spectroscopy (GB/T 197 19-2005
18 1 1: 1998，MOD)
GB/T 19720
Platinum alloy jewelry
Determination of platinum and palladium content
Ammonium chloroplatinate gravimetric method and dimethylglyoxime
Gravimetric method (GB/T
19720-2005，ISO
11210:1995, modified)
GB/T2 1 198.6
Determination of precious metal content in precious metal alloy jewelry
Inductively coupled plasma spectrometry
Part 6: Difference subtraction
QB/T 1689
Terminology of precious metal ornaments
SN/T2004.3-2005
Determination of hexavalent chromium in electronic and electrical products
Part 3: diphenylcarbazide spectrophotometry
three
Terms and definitions
The following terms and definitions apply to this standard.
3. 1
purely
elegant
The minimum mass content of precious metal elements is measured by one thousandth of the mass content of precious metal.
3.2
Find; to find out
mark
Signs are printed on precious metal jewelry.
3.3
Production label
mark
The general name of various descriptions used to identify products and their quality, quantity, characteristics, characteristics and uses. Signs can be expressed in words, symbols, numbers, patterns and other forms.
four
Purity range
4. 1 purity is the lowest value, and there should be no negative tolerance. See table 1 for the purity range of precious metals and their alloys.
4.2
The purity of jewelry accessories materials should be consistent with the main body. Due to the need of strength and elasticity, the accessory materials shall meet the following requirements:
4.2. 1
Gold ornaments with a gold content of not less than 9 16‰(22K) shall have a gold content of not less than 900‰.
4.2.2
For platinum ornaments with a platinum content of not less than 950‰, the platinum content of their accessories shall not be less than 900‰.
4.2.3
For palladium jewelry with a palladium content of not less than 950‰, the palladium content of its accessories shall not be less than 900‰.
4.2.4
The silver content of all-silver and thousand-foot silver jewelry shall not be less than 925‰.
Table 1 Purity range of precious metals and their alloys
Other expressions of purity of precious metals and their alloys: minimum thousandth/thousandth; Gold and its alloy 375
585
750
9 16
990
(999)9K
14K
18K
22K
Pure gold (thousands of gold) platinum and its alloy 850
900
950
990
(999) -
-
-
Foot platinum, foot platinum, foot platinum
(thousands of platinum, thousands of platinum) palladium and its alloy 500
950
990
(999)
-
-
Foot palladium, foot palladium gold (thousand feet palladium, thousand feet palladium gold)
Silver and its alloy 800
925
990
(999)
pure/solid/fine silver
Note 1: Values and expressions that are not in brackets will be given priority. Note 2: The theoretical purity of 24K is 1000‰.
4.3.
Elements contained in precious metals and their alloy jewelry shall not be harmful to human health.
4.3. 1
The contents of harmful elements such as lead, mercury, cadmium, hexavalent chromium and arsenic in jewelry must be less than 1‰.
4.3.2
Jewelry containing nickel (including non-precious metal jewelry) shall meet the following requirements.
4.3.2
. 1
For products used for piercing ears or any other part of human body, the release amount of nickel must be less than 0.2 μ g/(cm 2.week) during the healing process of piercing wounds.
4.3.2.2
Products that come into contact with human skin for a long time, such as:
-Earrings;
Necklaces, bracelets, bracelets, anklets and rings;
—— Case, bracelet and clasp;
-Snaps, buckles, rivets, zippers and metal labels (if not nailed to clothes).
The release of nickel from the long-term contact parts of these products with the skin must be less than 0.5 μ g/(cm 2. week);
4.3.2.3
If there is a coating on the surface of the product specified in the 4.3.2.2 clause, the coating must ensure that the nickel release from the long-term contact with the skin is less than 0.5 μ g/(cm 2.week) within two years of normal use.
4.3.2.4
Except for the products listed in 4.3.2. 1, 4.3.2.2 and 4.3.2.3, other similar products must meet the same requirements, otherwise they may not enter the market.
five
Jewelry product identification
Jewelry product identification includes imprint and label.
5. 1
Imprinted content
The contents of the stamp should include: the manufacturer's code, material, purity and the quality of the main diamond (above 0. 10 carat). For example, the jewelry seal of 18K gold inlaid with 0.45ct diamond produced by Beijing Fine Wire Mosaic Factory is: Jing A 18K gold.
0.45 carat (deep).
5.2 Expression method of purity mark
The text is printed according to table 1, and the attachment is printed according to 4.2.
5.2. 1
Gold jewelry: the combination of purity (K number) and gold, Au or G, such as: Gold 750( 18K gold), Au750(Au 18K) and G750(G 18K).
5.2.2
Platinum jewelry: the combination of purity and platinum (platinum, platinum) or Pt. For example: platinum (platinum, platinum) 900, Pt900.
5.2.3
Palladium jewelry: purity and combination of palladium (palladium gold) or palladium. For example: palladium (palladium gold) 950, Pd950.
5.2.4
Silver jewelry:
Purity and combination of silver, silver or sulfur. For example: Silver 925, Silver 925, S925.
5.2.5
When jewelry is made of precious metals with different materials or purities, the materials and purities should be indicated separately.
5.2.6
When jewelry cannot be printed due to reasons such as being too fine or too small, it should be accompanied by a logo containing the contents of the imprint.
5.3
label
Product labels should be marked in Chinese, such as Platinum 950 or Platinum Pt950.
six
assay method
6. 1
Determination of purity of precious metal jewelry
The content of precious metals should be determined by recognized methods, and GB/T should be used when the test results are different.
9288、GB/T
17832、GB/T
19720、GB/T
The method of 2 1 198.6 arbitrates the gold content in gold ornaments, silver content in silver ornaments, platinum content in platinum ornaments and palladium content in palladium ornaments respectively.
6.2
Determination of harmful elements
6.2. 1
The harmful elements such as lead, mercury, cadmium, hexavalent chromium and arsenic in jewelry should be determined by recognized methods. The determination of lead, mercury, cadmium and arsenic in jewelry can refer to GB/T.
2 1 198.6, please refer to 5.3-5.5 of SN/T2004.3-2005 for the determination of hexavalent chromium.
6.2.2
The release amount of nickel in jewelry was determined according to GB/T 197 19.
seven
Naming rules
7. 1
Precious metal jewelry should be named according to purity, material, gem name and variety.
For example: 18K gold red gem ring, Pt900 diamond ring.
7.2
The naming basis of precious metal jewelry varieties is QB/T.
1689.
7.3
The identification and naming of inlaid gems should comply with GB/T.
16552、GB/T
16553、GB/T
16554、GB/T
1878 1.