Platinum has a proportion of 21. 45g/cm3, much more than gold and silver. Hardness is 4. 3. Melting point is 1769.c. It is resistant to high temperature and is not easy to be oxidized in air. Not only can it be rolled into a very thin foil of platinum, but if one gram of platinum is pulled into a thin line, it can extend as long as 2,000 meters. These properties make platinum very useful in industry.
Platinum has increasingly shown its irreplaceable commercial status in jewelry manufacturing. Due to its stable physical and chemical properties, it is now widely used in jewelry manufacturing industry. The inlaid platinum can make precious stones more perfect and reflect its unique charm. In particular, the high quality of platinum diamond ring is regarded as a pledge of loyalty to love. Jewelry industry USES platinum, ruthenium alloy and platinum, iridium alloy more. Platinum and cobalt alloys are used in casting in Europe and Hong Kong. Bar made of platinum (85%) and palladium alloy in Japan. The international mark for a Platinum ornament is Pt, Plat, or Platinum, and is represented by a thousandth of the word purity, such as Pt900, for a purity of 900%o. The specifications of platinum jewelry in Japan are Pt1000, Pt950, Pt900 and Pt850.
The K bai jin adorn article that sells on the market, not platinum, a lot of consumer do not understand true picture, regard bai jin adorn article to buy as error. White K gold contains no platinum at all. Its main ingredient is gold, an alloy of gold with other metals such as silver, copper, nickel and zinc. White K king writes KARAT in English. WHITEGOLD(WG), K is a alloy of gold and other metals such as silver, copper, nickel and zinc. The difference between the two looks is very small, but a careful observation shows that the platinum color is silver white with a grey tone, and the luster is relatively strong. The weight of the platinum jewelry of the same style is about 120% of the white 18K gold (the density of 18K gold is about 14. 64 g/em3). Generally white 18K gold will be plated with palladium or rhodium during processing, but it is not durable and easy to wear. And the physical and chemical properties of platinum are stable, not easy to wear and erosion.
At present, there are also white 14K gold, white 10K gold, white 9K gold and other series of K gold products on the market. Platinum is also easier to distinguish from silver, which has a density of 10. 53g/cm3, hardness 2. 7.
The color is relatively white, with the copper needle to depict the mark, the silver jewelry throws the sound is dull, does not bounce, and the platinum elasticity is big, throws the time to give out clear and crisp sound. Now due to the introduction of foreign advanced production technology, from the visual effects of silver jewelry and platinum jewelry, the surface is also plated with rhodium or palladium, but according to its characteristics carefully to identify it is relatively easy.
