These are beautiful graduated watermelon/rainbow tourmaline polished nugget beads. Each strand is unique in color, shape, and size of the beads. Gently graduated these beautiful strands of rainbow tourmaline beads average 8-18mm in size. The color is completely natural. The name Tourmaline comes from the Sinhalese expression "tura mali" meaning stone of mixed colors. Tourmaline can be found in a wide variety of colors including green, pink, red, blue, yellow, brown, and black. This stone can also be bicolored (pink on the inside and green on the outside) which is aptly named watermelon or rainbow Tourmaline. Chiefly mined in Brazil and Africa, though some deposits of Tourmaline have been discovered in the United States. Tourmaline beads are said to enhance understanding and self confidence. Such a fantastic price for Rainbow Tourmaline.