9ct Yellow Gold Tanzanite 3mm Round Rub Over Set Stud Earrings. 03-20-126. These elegant 9ct yellow gold stud earrings feature two stunning tanzanite gemstones. 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. The earrings are completed by secure post and butterfly fastenings, perfect for any occasion. Wear as a single pair or mix with other pieces from our Essentials collection to create the perfect stacking look.  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 emerald and diamond pieces online and in store to compliment these earrings. All are lovingly and securely dispatched with our elegant jewellery packaging.  Dimensions: approx 3mm x 3mm.