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Antique sapphire and diamond cluster ring. Set with a natural unenhanced oval old cut sapphire to centre in an open back claw setting with an approximate weight of 4.50 carats, flanked to top and bottom with two round old cut diamonds in open back claw settings with a combined weight of 0.20 carats, further flanked by rows of round rose cut diamonds, sixteen in total with a combined weight of 0.30 carats. The total approximate diamond weight is 0.50 carats, to an elegant openwork form with pierced claws and intricate backholing, to crossover shoulders and a conforming flat solid shank. Tested 18 carat yellow gold, circa 1900.