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An extraordinarily fine antique 18K yellow gold ring by Tiffany & Co. set with a mixed cushion cut Burmese blue sapphire surrounded by old mine cut diamonds. All the gems are of the finest quality. The sapphire has been certified by the American Gemological Laboratories (see the following paragraph). The diamonds, ranging in size from approximately .22 carat to .29 carat each, are estimated at G/H color and SI to VVS2 clarity. The sapphire is set in a prong setting, while the diamonds are set in a shared-prong setting that creates a filigree appearance around the back of the crown. The shoulders of the shank are lightly decorated with beaded engraving.
Nearly all sapphires marketed in the last 150 years have been heated to improve the color. This is considered a standard practice. Other treatments, such as filling in fractures, altering the color family, etc., though considered bad practice, are nonetheless quite common. Fine Burmese stones from the Mogok region that have not been treated in any way are exceedingly rare and only show up in upscale jewels from makers such as Tiffany and Cartier. This particular stone, with its bright coloring and beautiful cut, is nothing short of stunning.
The AGL Brief (dated April 2008) indicates that the sapphire is natural; displays specific properties and characteristics associated with stones from Burma; measures 7.39 x 6.69 x 5.82 mm; weighs 2.49 carats; is cut in mixed cushion, has blue color, and shows no heat or additional treatments. The brief further indicates that unheated sapphires are scarce. The original brief will accompany the ring.
Origin: America, ca. 1890. Condition: excellent, all original, interior of shank has a period monogram. Finger Size: 4-1/4 (The ring can be sized up and we would recommend that the work be performed by Tiffany). Weight: 6.0 grams. Gemstone Weight: diamond (estimated by measurement), 2.25 carats; sapphire (by actual weight), 2.49 carats.