Tourmaline gives you a whole rainbow in a gemstone. It has the widest range of colours of any gemstone, coming in black, pink, purple, green, the rare and prized blue tourmaline, and watermelon, or a blend of pink and green.
Tourmaline goes into jewellery, of course, and also many believe it to have healing properties. Believers meditate on tourmaline tumblestones, that is, tourmaline polished in a stone tumbler, to improve their health and vitality. Seek the rainbow in a tourmaline.