① Pure gold: the gold content is 99%, which is more common in 1980s and 1990s when jewelry technology is not so developed, especially in gold-inlaid products;
(2) Sanjiu pure gold (formerly thousands of pure gold): the mainstream level of the market, and now these are basically pure gold products for sale;
③ 49 pure gold (original 10,000 pure gold): In recent two years, the market share has gradually increased, the content of 49 pure gold is relatively high, and the price is a little higher than the other two. In order to ensure the purity of jewelry, four pieces of nine pure gold must be formed at one time in the production process, and there can be no solder joints. (Solder is not pure gold, which will reduce the overall purity of gold jewelry) It is also technically difficult;
43D hard gold: The common explanation in the market is that 3D hard gold has changed its molecular structure with nanotechnology, making it more than four times harder than ordinary gold and difficult to deform during wearing. At the same time, 3D hard gold is also formed at one time, and the manufacturing difficulty will be improved. Now young people like it very much;
⑤ Five nine-gold products: Recently, five nine-gold products appeared on the market. I don't know if this is a gimmick or if there will really be such a high-purity product. Many people are also holding a wait-and-see attitude. What is certain is that if there are really five nines, the price will definitely be higher. The five nines of gold that can be seen in the market are all primary raw materials gold or gold bricks sold by banks.
⑥K gold, there are 9k, 14k, 18k and 22k in the market, and the names will be different according to the gold content. For example, 9k, which is common in Japan and South Korea now, contains 37.5% gold; 14k is common in Europe and America, with a gold content of 58.3%. 18k(75%) and 22k(9 1.6%) are common in shops, so as to distinguish them. The less the gold content, the harder the metal texture and the stronger the inlaid gems.