Colombian Emerald and diamond brooch-pendant, late 19th century. Estimate 12,000 — 15,000 GBP. Photo Sotheby's

Of foliate and scroll design, set with a trapeze-shaped emerald, circular-cut and rose diamonds, detachable brooch and pendant fittings. 

Accompanied by the Gem & Pearl Laboratory report no. 10718, stating that the emerald was found to be Colombian, with evidence of moderate clarity enhancement.

Sotheby's. Fine Jewels London, 18 Mar 2015, 10:30 AM