An Art Nouveau plique-à-jour enamel pendant, by Lucien Gautrait, retailed by BoucheronPhoto Christie's Image Ltd 2012

Designed as two opposed stylised swans, their curling necks forming pendant loops, their bodies framing a plique-à-jour panel depicting the sun setting over a lake with central lily-pad accent, suspending a single pearl drop, to a belcher link chain and further plique-à-jour enamel panel surmount with cow parsley motif, suspended from a fancy-link neckchain, after 1890, French marks for gold, 64.4cm long, fitted case by Boucheron. Signed L Gautrait. Price Realized £51,650

Christie's. Important Jewels. 12 December 2012. London, King Street