As a pure metal, platinum is silvery-white in appearance, lustrous, ductile, and malleable. It does not oxidize at any temperature, although it is corroded by halogens, cyanides, sulfur, and caustic alkalis. Platinum is insoluble in hydrochloric and nitric acid, but dissolves in aqua regia to form chloroplatinic acid, H2PtCl6. Platinum’s wear- and tarnish-resistance characteristics are well suited for making fine jewelry. Platinum is more precious than gold or silver. Platinum possesses high resistance to chemical attack, excellent high-temperature characteristics, and stable electrical properties. All of these properties have been exploited for industrial applications. Platinum is an extremely rare metal, occurring as only 0.003 ppb in the Earth’s crust. It is sometimes mistaken for silver (Ag) but platinum is whiter in appearance. Platinum is often found chemically uncombined as native platinum and alloyed with iridium. Most often the native platinum is found in secondary deposits; platinum is combined with the other platinum group metals in alluvial deposits. The alluvial deposits used by pre-Columbian people in the Choco Department, Colombia are still a source for platinum group metals. Another large alluvial deposit was found in the Ural mountains, Russia, which is still mined.
The extraordinary size and cut of this Tiffany diamond make it extremely rare, with a setting designed to showcase the center stone. Ring with an oval diamond in platinum. The specification of this ring is like this: Carat total weight 3.86, color grade E, clarity grade VVS1. And the price is also higher as $202,500.