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Vintage ruby and diamond coronet cluster ring. Set with a natural unenhanced cushion shape old cut Siam ruby to centre in an open back yellow gold claw setting with an approximate weight of 6.19 carats, encircled by a single row of ten round brilliant cut diamonds in open back claw settings with a combined weight of 4.00 carats, flanked by two horizontally set marquise shape brilliant cut diamonds to the shoulders in open back claw settings with a combined weight of 0.40 carats. The total approximate diamond weight is 4.40 carats, to an elegant cluster with an intricate open wirework gallery with backholing and trumpeted split shoulders, flowing down to a ridged solid lightly rounded shank with spring. Tested yellow gold and platinum, circa 1960, accompanied by AGL report CS58632.