Like jade, tourmaline comes in many colors. Individual crystals can grow quite large at times – a two-inch green example is shown below. They are also found in handsome clusters and penetrating quartz. When many narrow crystals (or hollow ones) are aligned, a cat’s eye effect may be achieved with a bright band that intensifies, fades and moves with the light. Gems are cut in a rainbow of single colors and multi-colored slabs are also used in rings and pendants. “Watermelon” tourmaline is famous. Blue is relatively rare with the intense blue-green Paraiba highly prized.