1, platinum in platinum is divided into Pt990, Pt950, Pt900 and Pt850 according to purity, that is to say, the content of platinum is 99%, 95%, 90% and 85% respectively. Only this metal can be directly called platinum.
Platinum has bright white luster, stable color and strong corrosion resistance, and is an ideal precious metal for jewelry. As early as the end of 18, platinum was widely used by European royalty. King Louis XVI of France called it "the only precious metal worthy of the title of king".
2. Platinum is a platinum alloy with gold as the main metal, supplemented by other metals such as nickel, chromium, copper and silver. According to the purity, it is divided into 22K, 18K, 14K and 9K, indicating that its gold content is 9 1.6%, 75%, 58.5% and 37.5% respectively, of which 22k,
A kind of K gold belongs to the alloy material of gold. (It is called 18K platinum in the market, which is not standardized and needs to be distinguished from the platinum mentioned above ~) 18K gold refers to alloy jewelry with a gold content of 750‰. If 250‰ palladium or nickel is added, its color will turn white.
3. Palladium refers to the element palladium, which is also a precious metal, with the symbol Pd. Never mix it with platinum Pt.
In terms of purity, only Pd990 and Pd950 have a content of 99%, and 95% of palladium also belongs to one of the platinum group metals. In palladium jewelry, the content of palladium should not be less than 850‰, and the common purity marks are Pd900 and Pd990.
In the natural state, palladium is silvery white metallic luster, which is not easy to fade, and its purity, rarity and durability are comparable to platinum. In addition, palladium, platinum, gold and silver are one of the international precious metal spot and futures trading varieties. There was a time when palladium ornaments were very popular, but now they are rare in the market.