How to draw a golden topaz

How to draw 3D gemstones and jewelrly with mixed media on gray paper. Drawing by Marcello Barenghi http://www.marcellobarenghi.com

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MUSIC:
"Black Box In the Ground" by Dan-O at http://danosongs.com ("Package" Licence)

FINAL PICTURE:
http://www.marcellobarenghi.com/2013/...

MY DRAWING TOOLS:
http://www.marcellobarenghi.com/p/mat...

THIS DRAWING TOOK ME:
3 hours and 10 minutes

Realistic drawing of a golden topaz gem, timelapse video of the entire drawing process, mixed media drawing on gray paper by Marcello Barenghi - Italian Art