Black Tourmaline Top Drilled Natural Crystals have a glass-like luster on their natural hexogonal crystal structure with no man-made faceting. These Black Tourmaline gems are top drilled so that they can be used as focal or component pieces. The Tourmalin beads show natural internal & external characteristics on the natural irregular crystal. These black Tourmaline gems have been untouched by human hands except for the drill hole processing. The deep black hue is a natural Tourmaline hue and is untreated.