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

A diamond crossover ring, by Boucheron, the pear-shaped terminals pavé set with brilliant-cut diamonds within beaded borders, to textured shoulders and polished shank, inner shank stamped ‘BOUCHERON Au750 H31595’, 18ct white gold mounted, ring size U (leading edge). £1800-2200