Crystalline Structures & The Crystal System
Mohs Hardness Scale
Cleavage in Gemstone
Colour in Gemstones and Minerals
Refractive Index of Gemstones
Birefringence in Gemstone
Diaphaneity or Transparency in Minerals
Gemstone Enhancements & Treatments
Silicate Mineral Class
Carbonate Mineral Class
Sulfate Class
Halide Mineral Class
Oxide Mineral Class
Sulfide Mineral Class
Phosphate Mineral Class
Element Class
Links:
[1] https://jewellery.iisuniv.ac.in/courses/subjects/introduction-gemology
[2] https://jewellery.iisuniv.ac.in/academic-year/2018-19