For the fineness of gold content of gold products, the national standard has very clear provisions, that is, every gold jewelry sold by merchants must be listed to indicate its gold content and weight. Gold with a gold content of not less than 99% is called pure gold, which is dark yellow and commonly known as two 9s.
Thousands of gold with a gold content of not less than 999 is called thousands of gold, which is the highest value in jewelry color naming. The stamps are thousands of gold, 999 gold, 999 gold or g999 gold. The imprint of gold jewelry includes manufacturer's code, material and purity, such as X Gold 990, XAu990 and X Pure Gold.
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The purity of extended data gold products is called "success" or "purity".
Theoretically, we call gold with a content of 100% 24K; ; Therefore, the calculation method is 100/24 (the national standard is in brackets): the national standard GB 1 1887-89 stipulates that the gold content per k (abbreviation of English carat and German carat, often written as "k") is 4. 16666%.
9k= 100%/24*9=37.5%(375‰)
14k =100%/24 *14 = 58.333% (585 ‰), which is set to 58.5% for easy identification.
18k = 100%/24 * 18 = 75%(750‰)
22k =100%/24 * 22 = 91.666666% (916 ‰) is set to 9 1.6% for easy identification.
In theory, 100% gold can be called 24K gold, but in reality it is impossible to have 100% gold, so China stipulates that gold with a content of more than 99.6% (including 99.6%) can be called 24K gold.
These kinds of K gold contents are general specifications of jewelry, and gold jewelry below 9K is not called gold jewelry according to national regulations.
Thousands of pure gold: the gold content of not less than 999 is called thousands of pure gold, which is the highest value in jewelry color naming. The stamps are thousands of gold, 999 gold, 999 gold or g999 gold. Pure gold: pure gold with a gold content of not less than 990. The stamps are pure gold, 990 gold, 990 gold or g990 gold.
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/baike . Baidu . com/item/% E8 % B6 % B3 % E9 % 87% 9 1/5 154727？ Fr = Aladdin "target =" _ blank "title =" Baidu Encyclopedia-Gold "> Baidu Encyclopedia-Pure Gold