General 18K gold-plated jewelry refers to jewelry made of precious metal materials with 18K gold as the shell and 925 silver as the inner core. The gold content of 18K gold-plated jewelry is between 10 ~ 15%, which is similar to chocolate technology. The advantage of this method is that it can not only ensure the jewelry to present the precious metal texture unique to 18K gold, but also reduce the cost. By using 925 silver as the inner core, the consumption of 18K gold is reduced, and the manufacturing cost is reduced, so that consumers can fully enjoy the high-grade jewelry with the texture of 18K gold, and the purchase cost of consumers is saved. This technology is the consistent technical standard of high-end jewelry brands in Europe and America.