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

A graduated South Sea cultured pearl necklace, the single graduated strand of white South Sea cultured pearls to a spherical clasp pavé set with brilliant-cut diamonds, between similarly set diamond roundel shoulders, mounted in white precious metal, stamped ‘750’, pearl diameters 9-13.5mm, necklace length 48cm. £1500-2000