IGI appraisal course is divided into three courses, diamonds, colorful treasures and rough diamonds. If you pass all the exams, you will get a certificate of G.G. Gem Appraiser, which is more practical. The course can start from scratch and there will be a lot of market information. Even a basic friend can climb to the top. If you want to engage in the diamond jewelry appraisal industry, then IGI is a good choice. They also have design courses to see if you need to learn design yourself.