A Renaissance Revival diamond

A Renaissance Revival diamond, multi-gem and enamel choker by A.E Köchert, the central cushion-shaped blue topaz mounted within a twisted enamel surround, accented by old-cut diamond and circular-cut multi-gem collets to the similarly-set entwined link neckchain with enamelled multi-gem set clasp, 36cm long, maker's mark AEK for A.E Köchert, with leather Köchert fitted case

Previously sold Christie's London, December 1st 2010, lot 255