An art deco sapphire, emerald and diamond jabot pin, by Cartier. Photo Christie's Image Ltd 2014

Of palmette design, centering upon a carved oval-shaped cabochon sapphire, to the calibré-cut emerald half surround, with pavé-set diamond and black enamel detail, the opposing terminal set with a carved emerald in a calibré-cut sapphire and pavé-set diamond surround, 1930s, 10.5 cm, with French assay mark for platinum. Signed Cartier Paris, no. 01229. Estimate CHF28,000 – CHF38,000 ($31,903 - $43,297)

Christie's. GENEVA MAGNIFICENT JEWELS. 14 May 2014, Geneva -http://www.christies.com/