The difference between palladium and platinum, platinum and k platinum] 1. Platinum is called k platinum and platinum, which is actually an alloy. Its code name WG(White Glod) also means platinum. Generally, WG 585 (14k,) WG 750 (18k) is commonly used for foreign stamps; Or just use mathematics to express the gold content. Platinum has good reflectivity and is not easy to lose its luster. Second, platinum is also called pure white gold. Its symbol is silver-gray pt, its specific gravity is 2 1.35, its melting point is 1.700℃, its Mohs hardness is 4-4.5 degrees, its chemical properties are stable, and there is no acid-base corrosion except aqua regia. Pure platinum is soft, and the addition of metals such as palladium, rhodium and ruthenium will increase its hardness. Three, platinum alloy gold refers to the alloy of platinum and other metals, such as palladium, rhodium, yttrium, ruthenium, cobalt, osmium, copper and so on. Although the hardness of platinum is higher than that of gold, it is not enough for inlay, and it must be alloyed with other metals before it can be used to make jewelry. The international seal of platinum ornaments is the words pt, plat or Platinum, which is expressed by a few thousandths of purity. For example, pt900 indicates a purity of 900%. The international specifications of platinum ornaments are PT 1000, PT950, PT900 and PT850. Fourthly, palladium is a member of the platinum group, and it is not easy to oxidize and lose its luster under normal circumstances. Oxides will be produced on the surface around 400℃, but when the temperature rises to 900℃, the luster will be restored. At present, palladium is cheaper than platinum, and platinum is used alone in jewelry industry or as a component of gold, silver and platinum alloys. To increase its hardness. Gold, palladium and platinum-palladium alloys are common in the market. [Understanding palladium in fashion jewelry] pd symbol, one of the platinum group elements. British chemist and physicist Wollaston separated new elements palladium and rhodium from crude platinum. The content of palladium in the earth's crust is about 100 million, ranking first among platinum elements. [Palladium has stable characteristics] Palladium is similar to platinum in color and appearance, and has metallic luster. Melting point 1555℃, hardness 4-4.5, relative density 12. Lighter than platinum, with strong ductility and slightly harder hardness. Chemical properties are relatively stable, insoluble in organic acids, cold sulfuric acid or hydrochloric acid, soluble in nitric acid and aqua regia, and will not be oxidized and tarnished in the air under normal circumstances. Palladium is one of the platinum group metals. In mineral classification, platinum group metals include palladium, rhodium, platinum and so on. , is a typical "noble family" in metal. [Rare, pure, noble and elegant] Although the international price of palladium and platinum is cheaper than platinum at present, historically, the international price of palladium and gold was about 300 yuan/gram higher than platinum (200 1 year1month 6, the international price of palladium and gold was as high as 1094 USD/ounce). Platinum and palladium platinum are the two minerals with the least reserves in the platinum group. Moreover, the international precious metal spot and futures trading market has four major trading varieties: palladium, gold, platinum and silver. [Palladium is also suitable for jewelry] Palladium is relatively stable and can resist acid corrosion. Palladium has almost no impurities and its purity is extremely high. The purity of palladium is also very suitable for skin, because unlike other metals, palladium does not have allergic reactions to skin. The international jewelry industry began to process palladium and platinum for jewelry and decorative works of art, and gradually formed a fashion trend. [Identification mark of palladium] The seal of palladium and platinum jewelry in the world is "or", which is expressed by a few thousandths of purity. For example, the purity of pd900 is 900%, and the specifications of PD platinum jewelry are PD 1000, PD 950 and PD 850. Palladium jewelry products enjoy the same quality after-sales service as platinum. We usually say platinum is platinum, and logo is PT. According to the content of platinum, 80%-85% is called PT850, 85%-90% is called PT900, 90%-95% is called PT950, and 99% is called PT990, which is also called full platinum. However, there is still a big gap between the prices of palladium and platinum, which is marked as PD. There is a certain gap between palladium and platinum in rarity and technology. In particular, palladium is not as malleable as platinum. If you want to distinguish between platinum and palladium, it is easier to distinguish from the logo. As long as it is a commodity of a regular manufacturer, it will have a logo on it. It is also relatively simple to distinguish from density. The density of pure white gold is 2 1.45, and the density of palladium is only 12, which is lighter than silver, so it can be distinguished by weight. Gold is divided into 9K, 14K, 18K, 22K and 24K, with gold contents of 37.5%, 58.5%, 75%, 9 1.6% and 99% respectively, of which 99.9% is called pure gold. When the gold content reaches 75%, different metal elements can be easily added and changed into different colors such as white, yellow, blue, gray and black, which is called K gold.