What 18kt mark on the case, said

Q: Will 18kt watch housing, said what does that mean? A: gold. 18Kt gold with 75%, 14kt gold with 58%, 22kt gold with 91.6 percent. Platinum is the main ingredient of gold, 750 gold contains 75% said, adding 25 percent other metals, so the color white, the value of the equivalent of 18K gold. 900, 950 generally indicates the content of platinum, 950 represents 95% of the platinum-containing metal. Platinum prices are now much higher than the market price of gold.