Platinum refers to metal platinum, chemical symbol Pt and chemical symbol Ag (1) of silver. According to national standards, jewelry products should be marked with seals and their purity. Platinum jewelry has a "Pt" seal. If there is an "S" on the jewelry, it is silver. For example, in S925 (2), the weight of platinum is 2 1.4, and the specific gravity of silver is 10.49. Specific gravity difference 1 times. You can usually tell by weighing it with your hand. (3) The burning platinum is resistant to high temperature and its melting point is as high as 1773. After high temperature burning and cooling, the color remains unchanged. However, silver has a low melting point, and the color after high temperature firing is red, black or black-red. (4) The chemical properties of platinum by chemical method are extremely stable, resistant to corrosion, and do not react with any acid or alkali, while silver is not resistant to strong acid corrosion.