You can exchange goods. But if it is not the quality problem of jewelry itself, merchants will generally exchange goods, but in principle, they can exchange goods without causing wear and tear. There may be a certain time limit for exchanging goods, and most merchants are allowed to exchange goods. It depends on whether there is a replacement service when you buy it.

Jewelry trading is a commercial contract, but it is settled in time without a written contract. Then we can only follow the convention, that is, if the precious metals industry has formed a convention in the course of many years of trading, we can refer to it. However, if it is a product quality problem, regardless of the convention or not, the merchant should return the goods unconditionally.