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

A pink sapphire Légers necklace, by Cartier, the tassel pendant necklace composed of collet set round mixed-cut pink sapphires with facetted belcher-link chain suspensions, mounted in 18ct yellow gold, clasp signed and numbered ‘XM5387’, in Cartier case and box and accompanied by corresponding Cartier certificate, pendant length 7cm, necklace length 58cm. £2000-3000