The most important thing is that you have a sweet mouth and say more good things. I think if you have around 160, you will be worthy of the audience. In fact, the so-called jewelry knowledge is just some information I showed you after the interview. Because the person you are dealing with is not professional, you are not professional, and no one will say you. But we should also know what the basic diamond 4C is, its gold content, K gold content and its maintenance. Say what you can. It's not good for you to prevaricate when guests ask you anything.