A Belle Époque Diamond Necklace, by Cartier. photo: Christie's Images Ltd 2012

The lattice ribbon-style necklace centering upon a stylized bow, suspending rope hoops and two tassel pendants, entirely set with diamonds, the central motif can detach to be worn as a brooch,with additional fitting and screwdriver, mounted in platinum, 1911, 35.0 cm, in navy blue leather fitted Cartier case. Signed Cartier, nos. 6312 and 46 (indistinct), with maker's mark for Atelier Henri Picq - Estimate CHF370,000 - CHF550,000 ($406,899 - $604,850)

Christie's. Jewels for Hope: The Collection of Mrs Lily Safra 14 May 2012 Geneva