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Art Deco sapphire and diamond three stone ring. Set to centre with a rectangular step cut natural unenhanced sapphire in an open back rubover setting with an approximate weight of 1.00 carats, further set with two round old cut diamonds in open back grain settings with an approximate combined weight of 0.70 carats, to a geometric design featuring polished edges and open backholing, the integrated shoulders leading to a solid D-shape shank. Marked platinum, maker's mark, numbered '25947', French, circa 1935, accompanied by Gemmological Certification Services report #79187-27.