Legal analysis
Lao Fengxiang's diamond ring should be convertible, but there should be a time limit. After all, it is easier to transform than gold. Once the diamond ring is formed, it will basically not change in the later stage. Another possibility is that customized diamond rings are usually non-convertible. No matter which jewelry store you are in, you should try to choose the jewelry items before selling them. It doesn't matter if you don't choose them. Once sold, it is difficult to return it, because jewelry is a valuable item, and there are strict appraisal procedures before sale, such as color, weight and style. Returning goods after leaving the store involves whether the goods have been replaced or damaged, and needs to be re-identified or certified. This is a very troublesome thing and can't be handled at the counter. If it is not a quality problem, it will not be returned. If you must return it, you need to keep invoices, original packaging, small labels on jewelry, etc. And the ring is not deformed, not changed in size and not dirty. If the other party promises to return the goods unconditionally, it can return the goods, otherwise the merchant can only claim to terminate the sales contract if there is fault or other breach of contract, otherwise it can't return the goods.
legal ground
Law of the People's Republic of China on Protection of Consumer Rights and Interests
Article 2 The rights and interests of consumers in purchasing and using commodities or receiving services for their daily consumption needs are protected by this Law. Matters not specified in this Law shall be protected by other relevant laws and regulations.
Twenty-third operators should ensure the quality, performance, use and validity of the goods or services they provide under the normal use of goods or services; However, consumers already know that there is a defect before buying goods or receiving services, except that the existence of the defect does not violate the mandatory provisions of the law. Where a business operator indicates the quality of goods or services by advertisements, product descriptions, physical samples or other means, it shall ensure that the actual quality of the goods or services it provides is consistent with the indicated quality. If consumers find defects in durable goods such as motor vehicles, computers, televisions, refrigerators, air conditioners, washing machines and other services provided by operators within six months from the date of accepting goods or services, and disputes arise, the operators shall bear the burden of proof for the defects.