Jewellery, Watches and Objects of Vertu to include the personal archive of Louis Osman, goldsmith and architect

A French diamond pendant by Mauboussin, the quatrefoil pendant composed of four heart-shaped diamonds, with central raised brilliant, each claw mounted to a yellow gold wirework setting, the reverse stamped ‘Mauboussin.Paris’, numbered ‘2727’, with eagle’s head guarantee mark, suspended from a diamond set chain mounted with nine brilliants on ropetwist back chain, stamped with eagle’s head mark, with ring and bolt clasp, pendant length 1.5cm, chain length 18.5cm. £10000-12000