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

A five stone sapphire and diamond ring, the three graduated brilliant-cut diamonds and two mixed-cut sapphires with pairs of rose-cut diamond points between, claw set to raised scrolled gallery, mounted in yellow precious metal, stamped ‘18’ and ‘GRB & Co’, ring size M. £300-500