It depends on whether you will only do business in China in the future, or whether you want to do better, such as buying goods from abroad or taking a high-end brand.

If you only do domestic circles, you have two choices: take GIC courses or NGTC China national inspection training, and one is enough.

However, if you want to do something bigger, I recommend you to study the training of IGI International Gemological Institute. They are now the largest jewelry appraisal institution in the world, and their certificates after study are also of high gold content. Now the bosses of those big brands in China have got the certificates. IGI is a short-term training and the working hours are well adjusted. The most important thing is that there are classes in China and there is no need to go abroad to take international courses.