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

An Art Deco diamond, ruby and onyx ring, the pierced domed tapered ring centred with a collet set old brilliant-cut diamond, to the centre of a tapering cross of graduated old brilliants, further accented with channel set baguette-cut onyx and fancy-cut rubies, (rubies untested for natural versus synthetic origin), mounted in white precious metal, later replaced shank, principal diamond approximately 0.45 carats, ring size M. £1200-1400