First of all, not all jewels are inlaid with 18K gold, but more are inlaid with 18K gold. 18K gold, which means 75% gold and 25% other metals. Its hardness is more suitable for inlaid jewelry, which is more stable and not easy to deform.

Pure gold, that is, gold, is relatively soft, so you are worried that it will come loose when setting gems. So most brands are inlaid with 18K gold.

Another kind of metal platinum, which does not contain gold, is not only used as jewelry, but also used in automobile exhaust treatment devices. Platinum jewelry used to be very popular, but in recent years, the international platinum price has been decreasing, depending on personal preferences.