A beautiful tanzanite and diamond ring from the historic New York jeweller, Tiffany & Co.. The central, violet-hued tanzanite stone is surrounded by a double halo of round brilliant-cut diamonds that continue on to the platinum band. This tanzanite ring would make a wonderful and unusual engagement ring for the woman seeking something that little bit different. Tanzanite, originally known as blue zoisite, is a highly prized gemstone that is formed beneath the volcanic plains of Mount Kilimanjaro in Tanzania. It wasn't discovered until 1967 and was renamed tanzanite by Tiffany & Co., branding it as a uniquely African gemstone. This mesmerising tanzanite and diamond engagement ring is available to buy online at Tiffany & Co., or from the Fine Jewellery department at Selfridges, London.