2. < Basic Course of Gems > The translated version of the textbook of British Gemology Institute is a series, which includes, however, the FGA certificate stipulates that the cover of the textbook is blue. Related to this, the red leather textbook "Translation of Diamonds" is very rigorous and has a good foundation, but it is different from domestic textbooks such as Systematic Gemmology. If you are a beginner, I suggest you study this set of teaching materials, which is very beneficial to further study in the future.
3. There are many books on gemology published by University of Geology Press. Yuan's books are very good, such as Diamond Classification Manual, Jade, etc. You should go to this teacher. He is now the president of this university, and the GIC textbook of the University of Geology is OK, but compared with the English textbook, it is still not rigorous enough, and many things are messy.
4. The books in this field are very confusing. Many books that seem to have good printing quality and rich pictures actually have no content and concepts, which are easy to cause obstacles to beginners. It is best to choose the above two books. If you want to study professionally, it is recommended to go to the correspondence class of Geological University, with professional teachers and specimens, because jewelry appraisal is more practical than theoretical after all, so as to ensure the quality of study and obtain corresponding certificates according to your own level.