The content of pure gold in decorative gold is called "gold position", which is Karat in English, so it is called K gold. Generally speaking, pure gold is 24K, which means that the gold content is 100% in theory. Therefore, 1K means that the gold content in gold ornaments accounts for 1/24, which is about 4. 16%. In China, 18K is generally used for inlaying jewelry, so the fastness of inlaying jewelry is relatively high. K gold refers to the alloy of gold mixed with other metals. Kai is the unit of measurement of K gold, which divides pure gold into 24 parts. According to the gold content in jewelry, it is divided into different kinds of gold, so 24K refers to pure gold. For example, the gold content of 18K is 18/24=75.0%. Because the gold content of 18K is 75.0%, it is also called 750.
The difference and composition of main K gold:
(1) gold jewelry (18K)
Gold jewelry (gold for short) is an alloy of gold and other precious metals, and different series of gold jewelry can be made according to the gold content. For example, 18K gold (750 gold) refers to ornaments containing 75% pure gold and 25% other precious metals. Common lettering is 750 or 18K.
(2) Platinum jewelry
Platinum jewelry (platinum for short) is slightly bluish white. For example, 750 platinum is an alloy composed of 75% gold and 25% precious metal, and the common lettering is 750 or 18K.