[Edit this paragraph] 1 Platinum

The so-called K platinum and platinum in the market are actually alloys of gold, nickel, copper and zinc. Or gold and silver, or alloys of gold, silver and copper. It also includes the gold-palladium alloy commonly used by masters in Taiwan Province Province. Its code name is WG (Platinum), which means Platinum. In the early days, 226 (60% gold, 20% palladium, 20% copper) was used to represent platinum, and 600/ 1000 pure gold, which is also commonly known as "material", which means silver-white metal plus gold instead of nickel alloy without gold. Generally, foreign stamps are commonly used; WG585( 14K), WG750( 18K) or only numbers represent gold content.

Platinum has good reflectivity and is not easy to lose its luster. Before platinum and palladium are widely used in the future, platinum is a silvery white metal mainly used for setting precious stones and jewelry.

[Edit this paragraph ]2 Platinum

Also known as pure white gold, positive platinum or true platinum. But these names are unreasonable and easily confused with platinum. Its symbol is Pt, silvery white, 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 it is not corroded by acid and alkali except aqua regia.

Pure platinum is relatively soft, and the addition of metals such as ruthenium, rhodium and palladium will increase its hardness. South American Indians made platinum jewelry as early as15th century, and Europeans didn't use it until after the middle of19th century. At present, China is the largest consumer of platinum, and its annual import accounts for more than 60% of the world's total output.

[Edit this paragraph ]3 Platinum alloy

Refers to the alloy of platinum mixed with other metals such as palladium, rhodium, yttrium, ruthenium, cobalt, osmium and copper. 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.

Platinum ruthenium alloy and platinum iridium alloy are widely used in jewelry industry. In Europe and Hong Kong, platinum and cobalt alloys are used for casting. In Japan, gold bars are made of platinum (85%) and palladium alloy. 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 the purity of 900% O. In Japan, the specifications of platinum ornaments are marked with Pt 1000, Pt950, Pt900 and Pt850.

[Edit this paragraph ]4 Palladium

It is a member of platinum group, silvery white, with symbol Pd, specific gravity of 12, lighter than platinum, stronger in ductility, slightly harder than platinum, and 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. 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. Ruthenium is sometimes added to increase its hardness. Common gold in the market, palladium's K gold and platinum-palladium alloy. Specifications are marked with Pd 1000, Pd950 and Pd900.

[Edit this paragraph ]5 The difference between platinum and platinum

International Platinum Association official explanation:

Platinum (Pt) is a natural white precious metal. According to national regulations, only jewelry with platinum content of 850‰ or above can be called platinum jewelry, and it must be marked with Pt. Platinum jewelry usually bears the purity mark of Pt850, Pt900, Pt950 or Pt990. Therefore, there is no so-called 18K or 750 (i.e. 750‰) purity in platinum jewelry.

Platinum, the main component of which is gold, is not natural white, but appears white after adding other metals. Platinum is not platinum (platinum). Platinum jewelry usually uses 18K or 750 to indicate the purity of gold contained in it.

Therefore, in China, only platinum is called platinum; Please refer to the "Platinum Credit Card" series launched by major banks.

Platinum is an element and platinum is a mixture. Platinum: Platinum is chemically more stable than gold and its price is higher than that of Huang Jingui. Used to make high-end jewelry. The "pt900" or "pt950" seen on jewelry products represent that the platinum content in jewelry is 90% and 95% respectively.

Platinum, commonly known as platinum, is pure white. The reserves of platinum in nature are scarcer than gold, so its price is higher than that of Huang Jingui. Platinum can keep the true colors of white diamonds, and it is very strong. It is the best material for setting diamonds, and it is diamonds that make platinum a superstar among precious metals in jewelry. In China, the colors used in jewelry inlay are mostly Pt950 and Pt900, and Pt900 is the most commonly used.

The Regulation and Naming Method for the Purity of Jewelry and Precious Metals stipulates that the total content of platinum and palladium shall not be less than 950‰. Platinum jewelry is crowned with platinum or Pt with a purity of one thousandth. For example: 990, Pt990 or enough platinum.

All platinum is soft, so if you want to set diamonds, you must form an alloy. Even adding 5% alloy can make Pt hard and meet the processing requirements. Part of the added alloy component must be platinum group metal.

The allowable purity in Japan is 1000.950.900.850, and there may be a slight (0.5%) negative difference. The purity of 850Pt is generally used for chains, and Pt900 is the most commonly used purity. As Japan is the most important export market in Hong Kong, Hong Kong adopts Japanese standards.

The United States stipulates that if the purity is called Pt, it must contain at least 50% platinum and 95% platinum group metals. Purity with platinum content higher than 95% can be marked with Pt. Jewelry with platinum content between 75% and 95% must also be marked with platinum group metals. Jewelry with platinum content between 50% and 75% must be marked with the name and content of platinum group metals. Such as 585 platinum and 365 palladium (585 platinum and 365 palladium). Only the United States allows "K platinum" alloy.

Specific gravity of Pt-Pd alloy: Pt950-20.64pt900-19.88pt850-19.5438+08.

K the difference between platinum and platinum. Strictly speaking, K platinum cannot be equated with platinum. Platinum is a natural white precious metal. At present, it is the highest price among all precious metals in jewelry. All platinum ornaments on the market have the symbol "PT", which is the English abbreviation of platinum. Platinum is a white alloy made of gold and other metals. The so-called 18K platinum is actually composed of 75% gold and 25% other metals. Therefore, K platinum cannot be marked with the "PT" mark, and only gold and purity can be marked according to its purity. For example, 18K platinum can only be stamped with "18K" and "G750". So, how to simply distinguish the two? First of all, it is more reliable to buy these precious jewelry in big shopping malls. The most important thing is to read the label clearly and see whether the jewelry is marked with "K" or "PT".

When purchasing platinum jewelry, the operator should be required to issue an invoice, and the invoice should indicate whether it is platinum or white 18k gold. It is best to indicate the weight of the jewelry, so it is easier to claim compensation in case of fraud.