Art Deco Colombian emerald and diamond cluster ring, circa 1920

Art Deco Colombian emerald and diamond cluster ring. Set to centre with an octagonal emerald-cut natural Colombian emerald with minor clarity enhancement in an open back rubover setting with an approximate weight of 0.90 carats, surrounded by a single row of sixteen round eight cut diamonds in open back grain settings with a combined approximate weight of 0.25 carats, flanked further by two cushion shape old mine cut diamonds in open back grain settings with a combined weight of 0.34 carats. The total approximate diamond weight is 0.59 carats, to an elegant geometric cluster design featuring polished edges, a pierced gallery with chenier motifs and fancy shape open backholing, leading to raised shoulders and flowing through to a solid D-shape shank. Marked platinum, circa 1920, accompanied by Gemmological Certification Services report #5786-2014.