Also known as k-platinum, it is an alloy made of gold and other white metals. Its code name is WG (Platinum), which means Platinum. White gold jewelry is often expressed as "18K platinum" or "14K platinum". It is essentially 18K gold, but the color is white. (platinum)
Symbol Pt, silver gray, specific gravity 2 1.35, melting point 1769℃, Mohs hardness 4-4.5 degrees, stable chemical properties, no acid and alkali corrosion except aqua regia. Pure platinum is relatively soft, and the addition of metals such as ruthenium, rhodium and palladium will increase its hardness.
Platinum and palladium are two minerals with the smallest reserves in the platinum group, and their metallurgical properties are quite similar. Because they are also rare and have similar uses, they often replace each other in various applications. In the international precious metal spot and futures trading market, there are only four varieties of gold, platinum, palladium and silver. (platinum alloy)
Refers to the alloy of platinum with other metals such as palladium, rhodium, yttrium, ruthenium, cobalt and copper. Although the hardness of pure platinum is higher than that of gold, it is not enough for inlay. It must be alloyed with other metals to make jewelry. The international symbol of platinum jewelry is the words Pt, Plat or Platinum, which is expressed by a few thousandths of purity. For example, Pt900 indicates a purity of 900‰. Commonly used platinum jewelry signs are Pt 1000, Pt950, Pt900 and Pt850. According to international regulations, if the platinum content is lower than pt900, it can't be called jewelry, but only platinum alloy. (palladium)
Platinum group element, symbol Pd, silvery white, lighter than platinum, stronger in ductility, slightly harder than platinum, insoluble in organic acids, cold sulfuric acid or hydrochloric acid, but soluble in nitric acid and aqua regia. Under normal circumstances, it is not easy to oxidize and lose luster. Jewelry industry uses it alone or as a component of gold, silver and platinum alloys to increase its hardness. Common in the market are gold, palladium, alloys of gold and platinum and palladium.