There is a contract between the rental store and the shopping mall. What percentage does the shopping center charge for each transaction? Why don't you want to invoice for diamonds? Because the diamond goods in the shopping mall have a high deduction point, while the jewelry brand earns less and the gold deduction point is less, it is best for the jewelry store not to issue invoices, and he does not have to give money to the shopping mall. That's why it's best to give you gold.

The electronic warranty is convenient for your later maintenance, and the invoicing of jewelry stores involves a deduction point.