If the merchant promises to return the goods unconditionally, it can be returned. 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.
Jewelry bought in a jewelry store can be returned. Unconditional return after shopping for seven days. The new consumer law gives consumers the right to regret online shopping, and they can return it for no reason within seven days. But in fact, it is not easy to realize this right in reality, and merchants often refuse to implement it on the grounds of "unopened".
Necklaces bought in jewelry stores can be exchanged, but there is a depreciation charge, so when buying jewelry, you should choose the right color and style and consider it before buying it. Otherwise, it will be very troublesome to regret after buying it.