How to draw a 3D amethyst gemstone

How to draw gemstones and jewelrly with mixed media on gray paper. 3D drawing by Marcello Barenghi Support my Facebook page: :) Drawing a amethyst gemstone with markers, coloured pencils and acrylic. Final picture: Materials used: It took me 3 hours and 35 minutes Music: “No Iron Rivers“ by Dan-O at (“Package“ Licence)