|As well a occurring in virtually all colors of the rainbow, tourmaline may also display multiple colors in a single crystal. Bi and Tri color tourmalines are not uncommon. Due to it's natural crystal shape tourmaline is often cut in long, slender facetted stones that run parallel to the length of the natural crystal rough.
Such stones may be bi or tri color with shades of green and red common end members. These are both native cut stones. Whenever a stone contains red in tourmaline, it is often included or shows internal fractures. Flawless red tourmalines are more rare than flawless stones of the other colors.