I think it is necessary to bring information, like buying home appliances. Don't you need relevant proof if something goes wrong? Moreover, jewelry is also an expensive kind of jewelry, so it is necessary to store the information purchased at that time, and it is foolproof! However, the psychic service is still good. If your bill is really gone, you should still consider helping it! You can go to the store for consultation! I checked the phone number of their store: 05 10-8687 1825. You can also call for advice. I hope I can help you, hehe!