Colombian emerald and diamond cluster ring, circa 1905.

Colombian emerald and diamond cluster ring. Set to centre with an octagonal emerald-cut natural Colombian emerald with minor oil in an open back rubover setting with an approximate weight of 2.20 carats, further set with sixty-eight round old cut diamonds in open back grain and rubover settings with a combined approximate weigh of 0.68 carats, and decorated with sixteen round rose cut diamonds in open back grain and rubover settings with a combined weight of 0.08 carats. The total approximate diamond weight is 0.76 carats, to an elegant double row cluster design featuring openwork with scalloped edging, a decoratively pierced gallery with foliate motifs, and fancy shape open backholing, leading to openwork shoulders with further foliate details and flowing through to a solid tapering shank. Tested yellow gold and platinum, accompanied by The Gem & Pearl Lab report #22901 and SSEF report #146640.