22K gold has higher hardness, longer wearing time and brighter color. Models change fashion.
Gold is generally 750 18K gold, 99 full gold and 24K gold. There are 999,000 gold and 99.99 million gold.
Extended data
Characteristics of K-gold:
1, one of the characteristics of gold is its high ductility, so it is difficult to inlay all kinds of exquisite styles, especially pearls, precious stones and jadeites. Therefore, people add a small amount of silver, copper, zinc and other metals to gold to increase its strength and toughness. The gold ornaments made in this way are also called K gold.
2.k gold can be made into various colors as required. K-gold jewelry popular in the world has various colors, and the common ones are yellow and white. When 25% palladium or nickel is mixed with gold, it will turn white, and its main component is gold. This is called platinum.
3. As far as the level of science and technology is concerned, it is impossible to extract pure gold material with the purity of 100% at present. Therefore, the gold standard K, which represents the pure gold content in gold products, generally calls pure gold 24K gold, but it only has a theoretical gold content of 100%, but it does not exist.
Therefore, in the national standard, merchants are not allowed to use the nonstandard standard method of "24K gold" to mark the gold content of gold jewelry. Since pure gold is called 24K, that is, the theoretical gold content is 100%, then 1K means that the gold product contains 1/24, which is about 4. 16%. 18K gold means that the gold content is 18/24, that is, it contains 75% pure gold, and the rest is other materials such as silver or copper.
4. As the saying goes, "Gold is not enough, no one is perfect". Generally speaking, gold jewelry contains other metals. 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.
The weight of gold ornaments shall use the national legal unit of measurement. Its gold content should use "K gold" (excluding 24K gold), "pure gold" (with a gold content of not less than 99%) and "thousands of gold" (with a gold content of not less than 99.9%), and non-standard methods such as "thousands of gold", "pure gold" and "24K gold" that do not actually exist should not be used.
References:
Baidu encyclopedia -K gold.