How to draw a 3D aquamarine ring

How to draw 3D jewelrly and gemstones with mixed media on gray paper. 3D drawing by Marcello Barenghi http://www.marcellobarenghi.com
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MUSIC:
"Sealed Heart" by G. Bertolino, C. Zatta
https://www.audioblocks.com/st....ock-audio/sealed-hea

FINAL PICTURE:
http://www.marcellobarenghi.com/2013/04/drawing-aquamarine-ring.html

DRAWING TOOLS:
http://www.marcellobarenghi.com/p/materials-used-for-my-drawing-video-on.html
THIS DRAWING TOOK ME:
3 hours and 20 minutes

Aquamarine ring realistic drawing by Marcello Barenghi - Italian Art