Gold ornaments can be divided into pure gold and k gold according to their gold content. The gold content of pure gold jewelry is above 99%, and the highest can reach 999.9%, so it is also called "99 gold", "all gold" and "red gold".
K-gold jewelry is made by adding other metals (such as silver and copper) to its gold material, which is also called "opening gold" and "molding gold". Due to the amount of other metals added, K gold jewelry with different K numbers is formed.
Extended data:
Gold purity measurement:
The purity of gold and its products is called "purity". There are two kinds of color marks of gold products in the market: one is percentage, such as
G999, etc. The other is K gold, such as G24K, G22K, G 18K.
Wait a minute.
In China, the imprint and identification card of gold products are stipulated. Generally, it is the manufacturer's code, material name, content stamp, etc. They are all necessary, and products without marks are unqualified. The same is true internationally. But for some very small products, it is also allowed to be unmarked.
Baidu encyclopedia-gold jewelry