A pearl and gemset gold necklace, India, 19th century. Photo Christie's Image Ltd 2014

The stringed cultured pearls with twenty pear-cut green hardstones, the pendant in the form of a floral bloom, the centre inset with an emerald surrounded by drop-shaped colourless gems and rubies, the reverse with further polychrome enamelled floral decoration, with pear-cut tourmaline drops, modern closing clasp; 17in. (43.2cm.) long. Estimate £800 – £1,200

Christie's. ART OF THE ISLAMIC AND INDIAN WORLDS INCLUDING A PRIVATE COLLECTION DONATED TO BENEFIT THE UNIVERSITY OF OXFORD, PART V. 10 April 2014, London, King Street - www.christies.com