Since the jewelry made of pure gold is too soft, it is difficult to inlay a variety of exquisite styles, especially when it is inlaid with pearls, precious stones and jadeites. Therefore, since ancient times, people know that a small amount of silver is added to pure gold. Metals such as copper and zinc, in order to increase the strength and toughness of gold, the gold ornaments made in this way are called gold ornaments. The production of the pure gold content in the decorative gold is called "golden position", the English is karat, the general translation is "open", and the English word can also be referred to as "K". Therefore, the jewelry is also called "K" gold. Generally speaking, pure gold is 24K, that is, the theoretical gold content is 100%. Therefore, 1K means that the gold content of gold ornaments accounts for 1/24, about 4.16%. China's consumption habits generally use 24K, 18K, while in some countries in Europe and America, 14K or 12K gold is often used to set up jewelry. One of the characteristics of gold is its high ductility, so it is difficult to inlay a variety of exquisite styles, especially when it is inlaid with pearls, precious stones and jadeites. Therefore, people add a small amount of silver, copper, zinc and other metals to the gold to increase the strength and toughness of gold. The gold ornaments made in this way are also called K gold. K gold can be made into various colors according to needs. There are various colors of K gold jewelry popular in the world. Everyone has yellow and white. When gold is mixed with 25% palladium or nickel, it will become white, and the main component that makes up it is gold. This is called white gold. As far as the level of technology is concerned, it is not possible to extract pure gold materials with a purity of 100%. Therefore, the gold standard K indicating the pure gold content in gold products is generally referred to as pure gold as 24K gold, but it is theoretically only 100% gold, which does not exist. Therefore, in the national standard, the gold content of the merchant's gold jewelry should not use the "24K gold" non-standard standard method. Since the pure gold is 24K, that is, the theoretical gold content is 100%, 1K means that the gold product contains 1/24 of pure gold, about 4.16%. 18K gold represents 18/24 gold, which is 75% pure gold, and the rest are other materials such as silver or copper.
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