Potentate Mining - The "Big Sky Sapphire" is to be auctioned by Sotheby's Magnificent Jewels Auction in New York in December 2015. Lot No. 344. The finished weight of this gem is
1.83-Carat Rich Sky Blue Ceylon Sapphire (Heated) - Earth's Treasury
1.17-Carat Sky Blue Ceylon Sapphire - Earth's Treasury