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Mellerio Art Deco diamond cluster ring. Set to centre with a cushion shape old mine diamond in an open back corner claw setting with a weight of 1.40 carats, surrounded by a single row of twelve cushion shape old cut diamonds in open back grain settings with a combined weight of 1.00 carats. The total approximate diamond weight is 2.40 carats, to an elegant octagonal cluster with a structured openwork conforming gallery, pierced backholing and flanked by gently sloping shoulders to a solid flat shank. Marked platinum, signed 'MELLERIO', numbered 'C5024', French, circa 1925.