Sommerville: Chalcedony-Onyx. Etruscan Ring, with scarabeus, found in an excavation near Cornetto. Etruscan Seals, Scarabei, Intaglios, and Rings, Case FF.
Vermeule: Chalcedony-Onyx. (Ancient swivel ring setting). Griffin springing to left, in cable border. Said by Sommerville to have been found in an excavation near Corneto (now re-named Tarquinia). Etruscan.
Turfa, Jean M. Catalogue of the Etruscan Gallery of the University of Pennsylvania Museum of Archaeology and Anthropology. Philadelphia: University of Pennsylvania Museum of Archaeology and Anthropology, 2005. See: p.153, no. 118; p. C4, pl.14
Berges, Dietrich K. Antike Siegel und Glasgemmen der Sammlung Maxwell Sommerville: im University of Pennsylvania Museum of Archaeology and Anthropology. Mainz am Rhein: Verlag Philipp von Zabern, 2002. Page/Fig./Plate: 78 See: p. 23, no. 12; taf. 4
Vermeule, Cornelius C. The Sommerville Gem Collection of the University Museum of Archaeology and Anthropology. The University Museum, 1956. See: no. 73