RingsAntique Cushion Diamond Cluster RingAntique yellow gold, cushion (about 2.00 carats) and European cut diamond cluster ring, c. 1890.Colored Diamond Three Stone RingYellow gold and platinum, European cut diamond three stone ring, with the central cognac colored diamond weighing 2.32 carats, in a contemporary mounting. 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.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 Vivid Yellow Diamond Three Stone RingPlatinum and diamond three stone ring containing an antique emerald cut vivid yellow diamond (2.12 carats) and a pair of European cut diamonds (1.91 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. 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.Antique Ruby and Diamond Cluster RingAntique yellow gold, ruby and diamond cluster ring containing a cushion shaped ruby (Thai origin) weighing 2.26 carats, with European cut diamonds, c. 1890.Fine Calibre Sapphire and Diamond RingPlatinum, European cut diamond and sapphire ring with a cabochon sapphire center, European, c. 1925. Mid-Century 7.28 Carat Emerald Cut Diamond RingPlatinum and diamond solitaire ring containing an emerald cut diamond weighing 7.28 carats (J color, VVS2 clarity) with a pair of tapered baguette diamond side stones, c. 1950.Emerald and Diamond Solitaire RingYellow gold, platinum, emerald and diamond solitaire ring containing an emerald cut emerald weighing 2.29 carats with a pair of tapered baguette diamonds. Art Deco Sugarloaf Sapphire RingPlatinum, sapphire and diamond ring containing a sugarloaf sapphire (Ceylon, no heat) weighing about 3.50 carats, American, c. 1920. Cartier Diamond and Onyx "Panther" Ring French 18 karat yellow gold, diamond and onyx "Panther" ring, Cartier, c. 1990.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.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.View More