RingsArt Deco Tourmaline RingArt Deco platinum, emerald cut rubellite and baguette diamond ring, c. 1920.Fine Antique Diamond Cluster RingFine antique platinum, diamond and sapphire ring containing a cushion cut diamond weighing about 4.50 carats set within a surround of shield cut sapphires and bezel set diamonds, c. 1910. 6.02 Carat Asscher Cut Diamond RingPlatinum and diamond solitaire ring containing a 6.02 carat Asscher cut diamond (J color, VS1 clarity) with a pair of tapered baguette diamond side stones, c. 1950. Emerald and Diamond Cluster Ring, c. 1900Edwardian platinum top, yellow gold back, octagonal cut emerald (Colombian, about 3.80 carats) and European cut diamond cluster ring, c. 1900. Antique Cushion Diamond Cluster RingAntique yellow gold, cushion diamond (about 2.00 carats) and European cut diamond cluster ring, c. 1890.Jade and Diamond RingFine platinum, pavé diamond and jade (natural, type "A") ring, c. 1950. Cushion Ruby and Diamond Three Stone RingPlatinum, ruby and diamond three stone ring containing a 1.97 carat cushion shaped ruby (Thai, no heat) with a pair of cushion diamonds weighing a total of about 1.68 carats (both E, VS1 and VS2), by Firestone and Parson.Contemporary 5.02 Carat Ceylon Sapphire RingPlatinum, sapphire and diamond solitaire ring containing a 5.02 carat cushion shaped sapphire (Ceylon, no heat) with modern round diamonds set to the band.8.55 Carat Ceylon Sapphire RingYellow gold, platinum, diamond and sapphire ring, set with a cushion shaped sapphire weighing 8.55 carats (Ceylon, no heat) with the mounting signed Schlumberger for Tiffany & Co.Fine Calibre Sapphire and Diamond RingPlatinum, European cut diamond and sapphire ring with a cabochon sapphire center, European, c. 1925. Emerald and Diamond Three Stone RingYellow gold and platinum three stone ring containing a 2.69 carat emerald (Colombian, minor oil) and a pair of European cut diamonds weighing 1.81 carats, by Firestone and Parson.Antique Platinum, Sapphire and Diamond Five Stone Ring Antique platinum, cushion sapphire and European cut diamond five stone ring, with carved sides, c. 1900. Oval Diamond Solitaire RingPlatinum and diamond solitaire ring containing a modern oval cut diamond weighing 2.83 carats (I color, SI2 clarity). David Webb Emerald and Diamond RingYellow gold, cabochon emerald, and diamond ring, with the emerald weighing about 10.00 carats, David Webb, New York, c. 1990. Rare Ceylon Sapphire and Colored Diamond RingYellow gold and platinum three stone ring containing a 6.08 carat cushion sapphire (Ceylon, no heat) with a pair of antique shield cut vivid yellow diamonds weighing a total of 2.37 carats, by Firestone and Parson.Victorian Carved Gold Diamond BandAntique yellow gold and old mine diamond 5-stone band ring with carved scrolling to the sides, c. 1890. View More