There should be no problem with the color of gold products, and there will be his color code on the inside of the products: for example, thousands of gold earrings, and he will have a 24K logo. If there is no sign, there may be a problem. But at present, the quality of products that can be sold on the counter must be tested by the testing department, so don't worry. Yimei Jewelry is an old brand with a history of more than 20 years in Guangdong. But it is rare in other places. There are branches in Hong Kong.