Art Deco Colombian emerald and diamond cluster ring. Set to centre with an octagonal emerald-cut natural Colombian emerald with no colour enhancement and minor clarity enhancement in an open back half rubover setting with an approximate weight of 0.60 carats, encircled by twenty-six round old cut diamonds in open back grain settings with a combined approximate weight of 1.61 carats, to a rectangular cluster design featuring polished and millegrain borders, a decoratively pierced gallery with scrolling motifs and fancy shape open backholing, leading to raised trumpeting shoulders with millegrain edging and flowing through to a solid D-shape shank. Marked platinum, indistinct maker's mark, circa 1920, accompanied by Gemmological Certification Services report #81309-89.
