The so-called pure gold means that the whole jewelry can reach the purity of 99.99. However, jewelry gold has a process, and a little flux or powder will be used when doing various processes. Regular brands fully meet national standards. Some brands have too much flux, and when they buy it, the price of gold is cheap, but if they have too much flux, they will lose a lot. As long as there are these ingredients, the country is not allowed to mark thousands of gold. Now the newly developed laser welding will be updated to the golden word. I hope it helps you.