I don't know if there is one in Guangzhou. I suggest you study jewelry design or go to a professional jewelry college. China Geo University (Wuhan) (Beijing) Jewelry College has both. Their teaching is the most professional in China at present. Professional settings are also complete, such as jewelry identification, jewelry business, jewelry design and so on. It is also easy for students who graduated from Geology and Jewelry College to find jobs. That's all that matters.