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

A diamond set dress ring, the central marquise-cut diamond in raised split collet setting, between pairs of small brilliant-cut diamonds, to shoulders of channel set brilliants, mounted in yellow and white precious metal, shank stamped ‘pt950’ and ‘18k’, principal diamond approximately 0.3 carats, ring size N. £200-300