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

Support my FACEBOOK page:
https://www.facebook.com/MarcelloBarenghi :)

FOLLOW ME ON G+:
https://plus.google.com/+marcellobarenghi

FOLLOW ME ON TWITTER:
https://twitter.com/BarenghiM

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

FINAL PICTURE:
http://www.marcellobarenghi.com/2013/05/drawing-golden-yellow-topaz.html

MY DRAWING TOOLS:
http://www.marcellobarenghi.com/p/materials-used-for-my-drawing-video-on.html

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