Aquamarine and diamond ring, Tiffany & Co. aquamarine and diamond ring, Tiffany & Co., of cluster design, centring on a cushion-cut aquamarine weighing approximately 2.04 carats claw set within a circular-cut diamond surround above similar set shoulders and gallery, together weighing 0.44 carats, mounted in platinum, numbered 28751729, size L, signed Tiffany & Co., accompanied by a Tiffany & Co. box