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

A diamond set silver gilt necklace, the riviere necklace of slightly graduated cluster links set with central foil backed lasque-cut diamonds within single-cut diamond surrounds, mounted in silver gilt, with a diamond set clasp, and a second later added double-S-shaped clasp, necklace length 43cm. £900-1200