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Art Deco sapphire and diamond coronet cluster ring. Centrally set with a rectangular step cut natural unenhanced sapphire in an open back half rubover setting with an approximate weight of 1.30 carats, further set with thirty four round eight cut diamonds in open back grain settings with an approximate combined weight of 1.00 carats, to an elegant openwork plaque form with pierced ornate gallery, open backholing, the slightly raised shoulders flowing to a solid D-shape shank. Marked platinum, numbered '464', circa 1935, accompanied by The Gem & Pearl Laboratory report #18759.