Tourmalines occurs in more colors and combination of colors than any other gemstone variety on earth. Tourmaline started its popularity when the Dutch started importing it in the early 17th century from Sri Lanka.
When viewing tourmaline, reds, oranges and yellows will look best under incandescent light, while greens, blues and violets look their best under daylight. Large crystal sizes enhance the depth and richness of color. Most tourmalines are left untreated.