A late 19th century emerald and diamond brooch pendant

A late 19th century emerald and diamond brooch pendant
The central rectangular cut-cornered emerald with rose-cut diamond border and rose-cut diamond openwork circular surround with old-brilliant-cut collet cardinal points, suspending a cushion-cut emerald and diamond oval cluster drop with later added pear-cut diamond drop, to a rose-cut diamond suspension loop, circa 1890, French import marks, detachable brooch fittings