Rubellite is the term used for red or pink tourmaline, and indicolite is the term used for blue tourmaline. Rubellite , when exhibiting a deep red color, is the most valuable form of tourmaline. The pink, emerald-green and multicolored stones are also fairly expensive. Multicolored stones are truly a gemological wonder, as their beauty and uniqueness are unparalleled. When used as a gem, it is green on one side and red on the other.
Tourmaline exhibits the interesting electrical properties of pyroelectricity and piezoelectricity .
When heated or rubbed, it attracts dust and dirt particles. This is caused by its atomic structure, which causes it to generate an electrical charge when heated or rubbed. Heat Treatment can enhance the color of some tourmalines. Some greenish stones can be made deep green, some brownish-red stones can be made red, and some light pink stones can be made colorless through heating. The color of some light colored stones can also be made into a deeper hue, and dark, transparent dravite can be made lighter.