A Belle Époque diamond and sapphire brooch, by Boucheron. Estimate CHF38,000 – CHF50,000 ($38,324 - $50,426). Photo Christie's Image Ltd 2015

Designed as an articulated diamond-set banner with calibré-cut sapphire detail, to the sapphire and diamond foliate surmount and pear-shaped diamond fringe, 1914, 8.0 cm, with French assay mark for platinum. Signed and with maker's mark for Boucheron 

Photo courtesy of the Boucheron Archives

Christie's. GENEVA MAGNIFICENT JEWELS, 10 November 2015, Geneva