Zhou Dasheng's jewelry is sold for life and likes cleaning; Maintenance is free for life, and there are more than 2,000 chain stores and diamond rings nationwide. No matter how many years you have taken it, as long as you keep the invoice and certificate, you need to add the 50 yuan certificate fee to the Zhou Dasheng you bought at that time. You can exchange it for a new style. If the original purchase price is higher than 1000, you can only make up the difference. If the same price is higher than 1000, there will be a depreciation charge of about 300.