Sapphire, Diamond, Platinum Necklace, Bvlgari. Estimate: $60,000 - $80,000. © 2015 Heritage Auctions.

The necklace features oval-shaped sapphires ranging in size from 7.45 x 6.65 x 4.00 mm to 10.95 x 10.20 x 6.50 mm and weighing a total of approximately 79.50 carats, enhanced by square-cut diamonds weighing a total of approximately 2.00 carats, set in platinum, marked Bvlgari. Gross weight 69.60 grams. Length: 16 inches

Heritage Auctions' Dec. 7, 2015 Jewelry Signature® Auction.