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Edwardian Colombian emerald and diamond coronet cluster ring. Set to centre with an oval old cut natural Colombian emerald with no colour enhancement and no clarity enhancement in an open back rubover setting with an approximate weight of 0.90 carats, encircled by twelve cushion shape old mine cut diamonds in open back rubover and grain settings with an approximate combined weight of 0.60 carats, all to an elegant coronet cluster design featuring millegrain edging, an intricately pierced gallery and open backholing, leading to raised shoulders with chenier detail and flowing through to a solid D-shape shank. Tested platinum and palladium, numbered '10', English, circa 1910, accompanied by Gem & Pearl Laboratory report #18474.