Colombian emerald and diamond coronet cluster ring, circa 1910.

Colombian Emerald and diamond coronet cluster ring. Set to center with one natural cushion-shape old cut Colombian emerald with minor oil in an open back rubover setting with an approximate weight of 1.70 carats, encircled by twenty-nine round eight cut diamonds in open back grain settings with a combined approximate weight of 0.30 carats and further adorned by eight round eight cut diamonds in open back grain settings with a combined weight of 0.08 carats. The total approximate diamond weight is 0.38 carats, to an impressive coronet cluster design featuring polished edges, an intricately pierced gallery with millegrain detail, and fancy open backholing leading to solid integrated shoulders and flowing through to a solid D shape shank. Marked platinum, circa 1910, accompanied by Gemmological Certification Services report #5786-3549.