An opal, pearl and diamond pendant necklaceEstimate £4,000 – £6,000 ($6,016 – $9,024). Photo Christie’s Image Ltd 2015

The central pendant designed as twin graduated pearl tassels with foliate surmount and fluted barrel-shaped centre to diamond-set detail suspending a pear-shaped opal pendant drop with diamond surmount, with flexible snake-link neckchain and oval barrel clasp, clasp signed Cartier, nos. 528, 525, 42.0cm long, pearls not tested for natural origin

Christie’s. JEWELLERY, 21 January 2015, London, South Kensington