Colombian emerald and diamond cluster ring. Set with a cushion shape old cut natural Colombian emerald with no colour enhancement and minor clarity enhancement in an open back yellow gold rubover setting with an approximate weight of 3.00 carats, flanked by two horizontally set rectangular baguette cut diamonds in open back rubover settings with a combined weight of 0.20 carats, further set with twenty round old cut diamonds in open back grain settings with a combined weight of 0.90 carats. The total approximate diamond weight is 1.10 carats, to an elegant octagonal stepped cluster with a geometric openwork conforming finger gallery and pierced backholing, flanked by gently sloping shoulders flowing down to a solid tapered ridged shank. Tested platinum with yellow gold setting, circa 1940, accompanied by Gemmological Certification Services report #5775-1688.
