Sotheby's auctioning 100+ carat diamond with no reserve

One of the largest diamonds ever discovered in North America is being sold by Sotheby's auction house.The 100+ carat diamond was discovered in the Victor mine in Ontario, Canada. Sotheby's says the diamond has perfect color and clarity and the cut is unparalleled. Sotheby's is also doing something unprecedented with the sale of the diamond: no reserve.The sale is October 5th in Hong Kong, but Sotheby's expects bids from all over the globe.