Generally, the type of gold material can be distinguished according to the words printed on it. If the words PT 900 and PT 950 are engraved on it, it means that the necklace you bought contains 90% and 95% platinum. If the characters such as Au 750, G 18K, 18K are engraved, it means that you have bought an alloy, which contains 75% gold, a certain amount of platinum and a small amount of palladium.

Of course, there are still some risks in printing. It is best to choose a reputable merchant. If you really care about the fineness of gold, you can go to the testing unit for testing, or you can go to the jewelry processing place. They will have a machine to measure fineness.

If you are in Shenzhen, you can go to Shuibei Jewelry Trading Center to buy it. Both the Hong Kong Alliance and Baoyi sell pure gold chains, which are cheaper, but they are all wholesale and not retail. You can quote the name of a jewelry company and say that you want to take one as the end of the chain.