40004934, Marlborough, 90, Portrait (frontal): Livia (?). Frontal bust of a woman, veiled. 'Livia'., Unknown, Boardman, J., Scarisbrick, D., Wagner C., Zwierlein-Diehl, E: The Marlborough Gems (2009), Story-Maskelyne, M.H.: The Marlborough Gems (1870), no. 90, Cameo, Sardonyx