Tourmaline Collection by jewelry designer Hanni Zel Zion, is big on color. Legend has it the tourmaline gem stone had a long journey from the center of the Earth, passed over a rainbow. In doing so, it assumed all the colors of the rainbow. And that is why it is still referred to as the 'gemstone of the rainbow' today. On a bed of 18k gold, this gemstone is a true collectors piece.