I like what you have done here. The colors are nice too. For the diamond, I am trying to se if you can figure out a way to show a prism of colors. This is just an example of what I am trying to explain:
http://www.ebay.com/itm/144x-AU-Swarovski-5301-4mm-Crystal-001-AB-Bicone-Beads-/260502167418