Richter, G.M.A.: Catalogue of Engraved Gems of the Classical Style (1920): 130-31, no.222
Comments: The image comes from a set of the Cades impressions, which contains a large series of Poniatowski portrait depictions. Among the heads of women only Cleopatra's has the Gnaios signature. Even though the profile is not close to the representations of Cleopatra on her coin portraits the loose bun and the attempt at a diadem are. She also seems to be wearing an Isis crown in her hair. This is probably the Poniatowski Cleopatra.
Link to this record using the address https://www.beazley.ox.ac.uk/record/198052D5-3C41-452C-8336-767C383A28F0