Colombian emerald and diamond coronet cluster ring. Set to centre with an octagonal emerald-cut natural Colombian emerald, with indications of minor clarity enhancement, in an open back rubover setting with an approximate weight of 1.00 carats, surrounded by twenty three round eight cut diamonds in open back grain settings with a combined approximate weight of 0.50 carats, to an elegant coronet cluster design with millegrain edging, an intricately pierced gallery and open backholing, the slightly raised shoulders supported by cheniers, flowing to a solid D-shape shank. Tested 18 carat yellow gold and platinum, circa 1930, accompanied by Gemmological Certification Services report #79184-33.
