With practical work experience, it is necessary to know something about jewelry products in systematics, but it is not difficult. Now that we are in our fifties, we can still study. Most of the students in that period have passed the Guangzhou Automobile Jewelry Appraiser, and the depth and breadth of teaching determine whether you can get the certificate. Well, I was admitted to yuanshi county Jewellery College, and it was many times a year, so it was not difficult to check for myself.