Manufacturers have their own after-sales standards. See if the invoice says: sold goods will not be returned or exchanged. Jewelry after-sales service is based on its own internal regulations, and there is no uniform standard. Once sold, it cannot be returned. Jewelry is a kind of resource commodity. Although you can't return it at will, there are also relevant regulations. In the Interim Measures for Three Guarantees of Yellow Platinum Jewelry and Jewelry and Jade Jewelry in Zhejiang Province, the "three guarantees" period of yellow platinum jewelry and jewelry and jade jewelry is clearly stipulated, and the time is 1 year. The validity period of "Three Guarantees" is calculated from the date of invoice issuance.