1, risk allocation. The buyer and the seller agreed on their respective rights and obligations in the contract. If the seller fails to provide the jewelry that meets the requirements as agreed, or the buyer fails to pay the payment as agreed, the law needs to clarify the attribution of responsibility to balance the distribution of risks and benefits.

2. Maintain fair trade. One of the purposes of contract legal liability is to protect the legitimate rights and interests of both parties to the transaction and prevent unfair trading behavior.