Colombian emerald and diamond coronet cluster ring. Set to centre with a square emerald-cut natural Colombian emerald with moderate clarity enhancement in an open back rubover setting with an approximate weight of 1.15 carats, further adorned with sixteen round eight-cut diamonds in open back rubover and grain settings with a combined approximate weight of 0.32 carats, to an elegant coronet cluster design featuring polished edges, a pierced scalloped gallery, and fancy shape open backholing, leading to raised shoulders with ridged detail and flowing through to a solid D-shape shank. Marked 18 carat yellow gold and tested platinum, indistinct maker's mark, circa 1915, accompanied by Gem & Pearl Lab report #23287.
