Self-taught gemstone identification requires the following steps: 1) Collect data. There are web pages, books and dictionaries. 2) Understand minerals and master their physical properties, such as types, hardness, refractive index and crystal axis. Master the chemical properties of minerals, such as chemical composition. 3) Understand the physical and chemical properties of crystals. 4) Understand the formation conditions and how to form crystals. 5) Learn crystal identification methods, such as polarization detection, hardness detection and inclusion detection. 6) Use the knowledge learned to distinguish materials with similar crystal appearance, such as glass, topaz, feldspar, etc.

Hehehe. . . Then you are an expert. Wish you success!