Antique Edwardian 2.50ct Emerald and Diamond Pendant Necklace

An antique emerald and diamond cluster pendant, the Colombian emerald drop (11.7 by 7.8 by 4.5 mm) with an estimated weight of 2.5 carats and framed by a cluster of brilliant cut diamonds millegrain set in platinum, the combined diamond weight estimated to be 0.90 carat, the trace chain in 18ct white gold added later.