Jewelry does not belong to the "three guarantees" law. But there is no way to achieve a unified standard that some parts of the industry support and some do not. Therefore, it is also recommended to be as cautious as possible when buying, and not to change constantly because of preferences. Of course, when buying, try to consider those stores with better after-sales service. Just like you said, Decheng Jewelry, its members have the benefit of exchanging old goods for new ones, and some big stores also support it.