It depends on what you want to take. Generally speaking, people who study this major first take GIC certificate, which is divided into GIC primary examination, certificate examination and diamond grading examination. Difficulty, I think it will be more difficult if you haven't studied it, because he has to test practice in addition to theory.
The teacher will talk about it when you report to class, but it will be easier if you read the book in advance. After all, people who take these exams basically have some basics, and teachers will attend classes faster. The reference books are Systematic Gemmology by Li Yali or Basic Gemmology Textbook by Wuhan University. Prepare time to look at the individual, mainly the backrest.
In the future, I think you are learning English. It is good and certainly useful to master one more thing.
As for the specific unit, it is estimated that it is difficult to enter an appraisal unit such as the Quality Supervision Bureau, because you have never studied this subject in undergraduate course, but maybe, because you study English, the society now has high requirements for English, so you are better than others. Others usually either go out to do business by themselves or go to a jewelry company, but as far as I know, those who can get a good family are all doing business by themselves.
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I think studying is good for you.