Thank you for inviting me. Generally, the jewelry industry has an operating rule, that is, Qian Shengqian, how much material cost you invest, and how much time and energy you invest in the operation. The combined part is cost, and the rest is profit. After selling the goods, convert them into cash and withdraw the investment from the payment of the goods. That is the cost, and the rest is the profit!

Personal opinion, not comprehensive, not strange!