K gold (or gold) is an alloy formed by the fusion of gold and other metals. The "k" of K-gold is the compilation of the foreign word "Karat". The complete expression is gold opening (that is, k gold), and "AU" or "G" is an international symbol used to express the purity (that is, gold content) of gold.
K-gold jewelry is characterized by less gold consumption, low cost, can be made into various colors, improved hardness and is not easy to deform and wear. K gold is divided into 24K gold, 22K gold, 18K gold and 9K gold according to the gold content.
Second, pure gold.
Pure gold is a Chinese word, pronounced as zújιn, which means gold with full color. 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.
Third, thousands of gold.
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.
Where the letter X is the manufacturer's code. When jewelry is made of precious metals with different materials or purities, the materials and purities should be indicated separately. When jewelry is too thin or too small to print, it should be accompanied by a logo containing the contents of the imprint.
On the eve of the Spring Festival of 20 15, the National Standardization Administration Committee published the revision of GB 1187-2012 "Provisions and Naming Methods of Precious Metals in Jewelry", which took effect on May 4, 2000/6. In the future, even gold with a purity of 999.0‰
Extended data
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.
To buy gold jewelry, we must first recognize the quality inspection marks of gold jewelry. Most of the gold ornaments sold in the market are equipped with inspection marks of quality inspection institutions, which clearly indicate the gold content and weight of the ornaments. 999 gold is also called thousands of gold, and the gold content is not less than 999 ‰; 990 gold is called pure gold, and the gold content is not less than 990 ‰; The gold content of 22K gold is not less than 916 ‰; 18K gold has a gold content of not less than 750 ‰; 14K gold has a gold content of not less than 585 ‰; The gold content of 9K gold is not less than 375‰.
In particular, consumers need to be reminded that 18K gold jewelry has three colors: yellow, white and red. White 18K gold is an alloy of gold and nickel, zinc, silver, copper and other elements, while platinum jewelry is not platinum products.
Baidu encyclopedia -K gold
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