18K has no diamond holder, only PT950 and 900 have empty drill holders, and 18K only has empty holders, which are inlaid with a lot of broken diamonds, which is boring to buy. In Shanghai Chenghuang Temple, most gold shops sell short, but the price is not 300 yuan per gram, but more than 4 yuan. If LZ is in Shanghai, I can tell you where to buy the price quoted in the gold transaction. It's no use talking if you're not in Shanghai.