Cleaning jewelry is very simple now. Just wash your glasses with an ultrasonic cleaner. Most jewelry stores now have this. Don't go to the gold place to wash. They all use royal water to wash. After washing, the grams will definitely be less. Although you don't have a receipt, a slightly larger jewelry store will recognize that it is easy to wash jewelry. There is no need to offend you. Cleaning jewelry is now part of after-sales service.