When buying gold jewelry, many people know that the gold jewelry in the general market is called thousands of gold, but when we visit the gold shop, we will find that many waiters will sell us thousands of gold jewelry with higher purity than thousands of gold. Because thousands of pure gold has only three 9s, and the purity is 99.9%, while thousands of pure gold has four 9s, and the purity is 99.99%. Therefore, the purity of thousands of gold is higher than thousands of gold, and the price of thousands of gold is naturally much higher than thousands of gold.
"Au9999" is the expression of gold purity stipulated by the state. Gold ornaments must be printed with this mark. "Au" is the symbol of the chemical element of gold. This shows that this metal ornament is made of gold. "9999" means the purity of gold (that is, "gold content"), that is, the gold content of this jewelry is 99.99%. This kind of gold, commonly known as "49 gold", is the golden brick in the general vault.
Gold with a gold content equal to or greater than 999.9‰ is commonly known as "Wanjinjin Series" and marked with "Wanjinjin" or "999.9 Gold". So thousands of gold is definitely thousands of gold, but thousands of gold is not necessarily thousands of gold. In the production process of AU9999 gold ornaments, the characteristics of gold autolysis at high temperature were utilized, and laser spot welding and collision welding processes were adopted to realize gold autolysis welding, without adding any auxiliary materials and abandoning the traditional "adding flux" process, thus ensuring the purity of gold ornaments and achieving the purity of raw materials.
The digital symbol of gold represents its purity, 999 is pure gold, and the purity of gold is 999 per thousand; 9999 is ten thousand gold, which means the purity of gold is 99900/ 10000, which means 9/ 10000. The difference between 999 and 9999 is mainly the difference in purity. 999 contains 99.9% gold, and 9999 contains 99.99% gold. But if you make jewelry, 99.9% is the highest, because it needs welding. It is said that jewelry 9999 is a fool, and gold bars are generally 9999. At present, the state stipulates that all gold ornaments must be marked with thousands of gold and thousands of gold, collectively referred to as pure gold.
The national standard only defines 999 thousand gold, which means that thousands of gold is the highest purity. Even if 9999 gold is sold again, it can't be detected at the time of purchase, so it can only be said that 9999 is a kind of high-purity gold, which is called "ten thousand gold" by the public in the market, which sounds higher than "thousands of gold". In fact, when you know the percentage mentioned above, you will know that no matter how high the percentage is, there will be no 100% pure gold.