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Art Deco sapphire and diamond three stone ring. Set with a rectangular step cut natural unenhanced sapphire in an open back rubover collet setting with an approximate weight of 1.00 carats, flanked by two round old cut diamonds in open back grain set tapered box collets with an approximate combined weight of 0.70 carats, to a heavy tapered form with open backholing and a conforming finger gallery, leading to a solid shaped shank. Marked platinum, maker's mark, numbered '25947', French, circa 1935, accompanied by Gemmological Certification Services report #79187-27.