1950s Colombian emerald and diamond octagonal cluster ring

1950s Colombian emerald and diamond octagonal cluster ring in platinum and 18kt yellow gold. Centrally set with an estimated 1.65ct octagonal emerald cut Colombian emerald with minor oil in a platinum millegrain setting, bordered by fourteen round brilliant cut diamonds in grain settings, to an elegant geometric cluster design with millegrain frames, pierced floral gallery and met to either side with trumpeting shoulders which curve to a solid shank. Accompanied by a WGI certificate.