Rare Diamond and Colored Stone JewelryUnusual diamonds and sapphires, rubies, and emeralds from important mines. Rare Russian Cuff BraceletYellow gold, old mine diamond and cabochon emerald bangle bracelet, the emeralds (Colombian) weighing a total of about 7.00 carats, St. Petersburg, c. 1870, with royal provenance.Fine Antique Pear Shaped Diamond Drop EarringsPair platinum and diamond drop earrings containing a pair of antique pear shaped diamonds weighing a total of about 5.90 carats, in contemporary mountings made by Firestone and Parson. 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.Rare Pair of Line BraceletsVery fine pair of platinum, square cut Columbian emerald and square cut diamond 5 x 5 alternating line bracelets of unusual width, c. 1935.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.