Like iolite, tourmaline has dichroic color-changing properties depending on how it is cut. A gemcutter must take care that he cuts the stone the right way, because cutting on the wrong angle will cause the translucent tourmaline to appear cloudy, dark, and even muddy.
The darkest tourmalines, such as turquoise and green tourmalines, can be heated to lighten the colors. Also, the pink and red tourmalines may have irradiation to enliven the colors.
When tourmaline's not on its own, you can find it included in quartz, creating the stone called tourmalinated quartz, or tourmalated quartz. Like quartz, tourmaline is made of silica, but also a handful of other elements, such as boron, aluminum, iron, sodium, and lithium.
Kim Burns wire wrapped this approximately 14ct, 13mmx19mm Tourmalated Quartz stone with Argentium Silver wire, using Dale's Prong Ring DVD!