Natural jewelry and jade are divided into natural gems, natural jade and organic gems.
Artificial jewelry and jade are divided into synthetic gems, reconstructed gems, assembled gems and artificial gem.
There are many kinds of jewelry, each of which has different identification characteristics. Some jewelry identification needs the help of instruments, so I won't describe it in detail here. The suggestion of jewelry and jade appraisal refers to the national standard GB/T 16553-20 10.
If you want to study systematically, sign up for a class. Practice is the best.
At the same time, you can learn jewelry professional books, such as gemology, crystallography, mineralogy, crystal optics, systematic gemmology and so on.