Tanzanite and diamond necklace, Tiffany & Co., the front designed as a double-swag of four cushion-shaped tanzanites together weighing approximately 19.35 carats, set at intervals between baton shaped links pave-set with round brilliant-cut diamonds completed by a similarly set baton link necklace, the diamonds together weighing 2.27, mounted in platinum, internal circumference approximately 410 mm, signed Tiffany & Co