Drawing of different geometrical shapes
Size and Shapes of Gem Stones
Facets drawing and rendering
Drawing & rendering of Cabochons stones
Finishing and enhancement of designs using different settings
Judith Crowe -The Jeweller's Directory of Gemstones: A Complete Guide to Appraising and Using Precious Stones, from Cut and Colour to Shape and Setting [2]
Adolfo Mattiello -Techniques of Jewelry Illustration and Color Rendering Published in 1995, DuMatt Corp. (Guttenberg, N.J).
Links:
[1] https://jewellery.iisuniv.ac.in/courses/subjects/gem-stones-illustration-rendering-techniques
[2] http://www.amazon.com/Jewellers-Directory-Gemstones-Complete-Appraising/dp/0713676566/ref=sr_1_1?ie=UTF8&s=books&qid=1228538886&sr=1-1
[3] https://jewellery.iisuniv.ac.in/academic-year/2015-2016