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

A diamond cluster ring, the central brilliant-cut diamond in raised square millegrained setting, within a cluster surround of smaller channel set brilliants, between millegrained diamond set shoulders, mounted in white precious metal, shank signed ‘Browns’, stamped ‘750’ and numbered ‘252337’, in Browns’ case, ring size L½. £160-200