A 6.72-carat, oval-cut, Tanzanian alexandrite set as the centerpiece of an 18k white gold ring, framed by a marquise-cut and oval-cut diamond surround appeared at Sotheby's New York December 7, 2011 Magnificent Jewels Sale. The lot sold within the estimated range of USD 50,000-75,000 for USD71,500, working out to a price-per-carat value of USD10,640. An AGL report accompanying the lot, certified the Tanzanian origin of the stone, and its pronounced color change.
