An impressive French diamond-set floral corsage

An impressive French diamond-set floral corsage, 1950s, separating to form two brooches, each piece set with graduated circular diamonds to the leaves and with a central stem and upper tendrils of baguette-shaped and further circular-cut diamonds in white gold and platinum, French control mark and unidentified maker's lozenge mark, initials SC and further unidentified marks, the separated brooches 8.0 and 9.5cm long