18ct White Gold Tanzanite and Diamond Pear Drop Earrings. 03-14-056. These oval stud earrings feature two beautiful Tanzanite gemstones set in 18ct white gold. 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. We have an expert team of gemstone and diamond specialists who handpick and grade each jewel to meet our high standards and a team of talented in house designers who combine their talents to bring you our exclusive Precious Gemstone collection. You can find other tanzanite pieces online and in store to complement these earrings. All are lovingly and securely dispatched with our elegant jewellery packaging.  Dimensions: 6mm x 4mm.