18ct white gold 189ct tanzanite round brilliant stud earrings ew673tz the tanzanite collection by tivon showcases one of the worlds most desired stones that is considered a thousand times rarer than the diamond this seductive gemstone can exhibit a variety of surreal colours including blues violets and burgundies so each piece is truly unique and beautiful these tanzanite claw set earrings are a striking and classic piece boasting round 189ct tanzanite set into beautifully contrasting 18ct