18ct White Gold 1.25ct Tanzanite Diamond Cushion Stud Earrings. TS1058E. Tanzanite is the blue/violet variety of the mineral Zoisite, discovered in the Mererani Hills of Northern Tanzania. The Tanzanite collection showcases one of the world\'s most desired stones that is considered a thousand times rarer than the diamond. These elegant 18ct white gold, 1.25ct Tanzanite and 0.10ct diamond earrings are part of our Tanzanite collection. Featuring a gorgeous cushion shaped Tanzanite claw set into exquisite 18ct white gold setting, these earrings also boasts brilliant cut diamonds pave set surrounding the gemstone. All articles are lovingly and securely dispatched with our elegant jewellery packaging. Matching items also available within this collection.