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Cabochon Ceylon sapphire and diamond coronet cluster ring. Set centrally with one oval cabochon natural unenhanced Ceylon sapphire in an open back claw setting with an approximate weight of 22.00 carats, encircled by twenty six round old cut diamonds in open back rubover settings with a total approximate weight of 0.85 carats, to an impressive coronet cluster design with scalloped edging, a pierced openwork gallery with scrolling details and shaped backholing, flowing through to open trumpeting shoulders leading to a slim shank. Tested yellow gold and platinum, circa 1920, accompanied by Gemmological Certification Services report #78167-27.