According to the K-gold system, there are 24 kinds of K-gold, and 24k gold is pure gold with a theoretical value of 100%. Accordingly, the gold content of1k =124 and 14K gold is calculated as follows:14k =100%/24 *14 = 58.333% (585 ‰
For the convenience of identification, it is generally agreed that the gold content of 14K gold is 58.5%.
China's national standard GB 1 1887-2008 "Regulations and Naming Methods of Precious Metals in Jewelry" stipulates that 14K gold is k gold with a gold content of ≥58.5%, which is also commonly known as "60% gold". However, because its color is paler than pure gold, gold ornaments made of it often need to be gilded again. After long-term use, the gold plating on the surface will be worn and faded.
Extended data:
14k gold is golden in color, not easy to rust and corrode, and gloss retention is good. Hard texture, high toughness, strong elasticity, can be inlaid with all kinds of gems.
"K" is a symbol used internationally to indicate the purity (i.e. gold content) of gold. Generally speaking, the more silver in K gold, the bluer the color. If the proportion of copper is large, the color is purple. In theory, gold with a content of 100% is called 24K (24K gold is often regarded as pure gold with a composition of 100%, but the actual content is 99.99%, which is converted into 23.988K). The calculation method is 100/24.
Most of the K gold traded in the market is 24 K gold, 22 K gold, 18 K gold and 14 K gold. In theory, 100% gold can be called 24K gold, but in reality it is impossible to have 100% gold. Therefore, China stipulates that gold with a content above 99.6% (including 99.6%) can be called 24K gold. These kinds of K gold are the general specifications of jewelry, and the state stipulates that gold jewelry with low K value cannot be called gold jewelry.
Baidu encyclopedia-14k gold