Natural Unheated Tanzanite in a Shield CutNatural unheated Tanzanite cut by Steve in a one of a kind barion style shield cut. Natural untreated color. This is a rare example of the natural unheated color of material that would treat to top gem color. This is known a "diesel color" to the miners, accepted as the most valuable rough color. A investment in the future when tanzanite is no longer available this will become one of the few natural gems in existance. A true museum piece. Picture has