Edwardian emerald and diamond coronet cluster ring, circa 1910.
Edwardian emerald and diamond coronet cluster ring. Set to center with one octagonal shape emerald cut emerald in an open back claw setting with an approximate weight 0.25 carats, encircled by twelve cushion shape old mine diamonds in open back grain and rubover settings, with a combined approximate weight of 0.36 carats, to an elegant coronet cluster design featuring millegrain boarders, a decoratively pierced openwork gallery and fancy openwork backholing, leading to raised shoulders and flowing through to a solid D-shaped shank. Marked platinum, marked platinum and tested yellow gold, maker's mark 'AR', circa 1910.