Tourmaline is a truly unique and fascinating gemstone. Tourmaline is a fairly hard stone; it measures 7 to 7.5 hardness on the Moh’s scale. It can come in almost all of the different colours of the rainbow, including green, blue, pink, red, black, orange, and brown, plus many shades and combinations of the various colours.  

Tourmaline may have one colour on side of the mineral and another colour on the other side. Gemstones cut with two or three colours of tourmaline are more rare and are called bicolour or tricolour stones.