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

An emerald and diamond cluster ring, the rectangular step-cut emerald with canted corners claw set within a surround of brilliant-cut diamonds, mounted in 18ct yellow and white gold, shank hallmarked for London, 1999 and bearing maker’s mark ‘THJ’, total diamond weight approximately 0.75 carats, ring size S. £600-800