K is the abbreviation of Karat, which is an international symbol used to express gold content. \x0d\K There are basically three colors (yellow, silvery white and pink rose) of 24K gold in the gold market: the purity of gold is above 999(99.9%), which is called pure gold, pure gold, real gold and 999 gold. \x0d\22K gold: 24K gold (9 1.7%)+ silver copper alloy (8.3%), yellow ternary alloy. \x0d\ 18K gold: 24K gold (75%)+ silver-copper alloy (25%), yellow ternary alloy. \x0d\ 18K gold: binary alloy of 24K gold (75%) and copper (25%), reddish. \x0d\ 18K gold: 24K gold (75%)+ silver (6%)+ copper (19%) ternary alloy, pink. \x0d\ 18K platinum (white 18K gold): pure gold is a silver-white ternary alloy of (75%)+ silver (10%)+ palladium (15%). 14K platinum (white 14K gold): pure gold is a ternary alloy of (58.5%)+ silver palladium (4 1.5%), silvery white. \x0d\ 14K gold: pure gold (58.5%)+ silver-copper alloy (4 1.5%), yellow. \x0d\ 12K gold: pure gold (50%)+ silver-copper alloy (50%), yellow. \x0d\ 10K gold: pure gold (4 1.7%)+ silver-copper ternary alloy (58.3%), yellow. \x0d\9K gold: pure gold (37.5%)+ ternary alloy of silver and copper (62.5%), yellow. \x0d\ gold (Au): yellow precious metal, pure gold 999 is generally called 24K, with soft texture and strong plasticity. \ x0d \ kGold- bright yellow precious metal alloy, which is not easy to make exquisite jewelry because of its soft texture, is composed of gold (Au), silver (Ag), copper (Cu) and so on. Used as high-grade jewelry inlay alloy, graded by gold content. The gold content of 750 is called 18K, and the gold content of 585 is called 14K. Platinum: A white alloy that replaces platinum. It is a white alloy composed of gold (Au), palladium (Pd) and silver (Ag). Because its appearance color is quite similar to platinum, it is not easy to distinguish in appearance, and it is often mistaken for platinum, but there is a clear gap between them in texture and weight. Platinum is higher than platinum in texture density and commodity value, but platinum has a price. Platinum (PT)_Pt 1000: platinum is 1000, platinum. \x0d\Pt950: binary alloy containing 95% platinum and 5% palladium. \x0d\Pt900: binary alloy containing 90% platinum and 10% palladium. \x0d\Pt850: ternary alloy containing 85% platinum, 15% palladium and copper. \x0d\ Platinum (PT) generally refers to the binary alloy of platinum 95%+ precious metal 5%, which is called pure gold, positive platinum or true platinum in decorative gold. 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 soft, and adding ruthenium, rhodium, palladium and other metals to decorative gold will increase its hardness.