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Cushion shape diamond coronet cluster ring. Set with a central cushion shape old cut diamond in an open back claw setting with a weight of 0.75 carats, encircled by a single row of ten round old cut diamonds in open back grain settings with a fine rubover border and a combined weight of 0.70 carats. The total approximate diamond weight is 1.45 carats, to an elegant cushion shape cluster with a scrolling openwork finger gallery, intricate backholing and flanked by split tri-part shoulders, tapering down to a solid D-shape shank. Tested platinum,English circa 1920.