Art Deco Colombian emerald and diamond cluster ring. Set to centre with an octagonal step cut natural Colombian emerald with no colour enhancement and minor clarity enhancement in an open back rubover setting with an approximate weight of 3.20 carats, further decorated with sixty four round eight cut diamonds in open back grain settings with a combined approximate weight of 0.80 carats, to a geometric cluster design featuring intricate linear openwork and millegrain edging, a decoratively pierced gallery and fancy shape open backholing, leading to raised shoulders and flowing through to a solid D-shape shank. Tested platinum, circa 1920, accompanied by Gem Research Swiss Lab report #GRS2020-017228.
