18K gold is about 75% pure gold.
The new naming rules for precious metals (GB/T 1 1887-2000) promulgated in 2000 clearly pointed out that "platinum" is actually a generic term for "platinum" and "platinum" is equivalent to "platinum". As we all know, the price of platinum jewelry in the market is much higher than that of gold, and the sales price of other alloys is incomparable to platinum. In addition, platinum and its related ornaments are more collectible than gold because of their scarce output and excellent texture. Although many jewelers dare not call some alloy ornaments platinum publicly, they have created another name, "18K platinum" or "white 18K gold" to confuse the real with the fake.
The staff of Nanjing Consumers Association told the reporter that in fact, most of the "18K" platinum necklaces, rings and pendants on the market at present refer to 18K gold, and the gold content of some products is less than 18K. The so-called white gold is actually a white mixed metal synthesized by metals such as titanium, silver, nickel, rhodium and copper, not platinum. Some merchants sell this product as "18K platinum", which is an act of misleading consumption and deceiving consumers. According to national standards, the purity of gold is indicated by "K". For example, 18K gold generally refers to gold ornaments with a gold content of 75%. The purity of platinum (platinum) is expressed by "Pt", which is the symbol of chemical elements of metallic platinum.
Platinum is generally called Pt900 or Pt950 according to its purity, and platinum cannot be represented by K.