But in general

1, basic identification of jewelry

2. Basic knowledge and characteristics of precious metals

3, jewelry wearing precautions: different people wearing the same piece of jewelry has different effects, depending on height, size, color, temperament, dress, etc. Introduce suitable jewelry for different people.

4. Understand the culture: the connotation and significance of zodiac, constellation, traditional culture and precious stones need to be understood.

5, jewelry maintenance

6. You are glib and warm in service.

. . . . . . . . .

That's basically all. Enrich yourself more. Your knowledge is not that narrow. Over time, you will find that many things are interconnected.

I hope my answer can help you.