Carnelian oval set in a 17th–18th century gold ring

Inscription: "Gnaios"

Bracci, Domenico Agostino. 1784. Memorie degli antichi incisori che scolpirono i loro nomi gemme e cammei, vol. 1. pp. 298–99, Florence: G. Cambiagi.

Richter, Gisela M. A. 1920. Catalogue of Engraved Gems of the Classical Style. no. 222, pp. 130–31, pls. 59–60, New York: The Metropolitan Museum of Art.

Richter, Gisela M. A. and Christine Alexander. 1939. Augustan Art: An Exhibition Commemorating the Bimillennium of the Birth of Augustus. p. 24, fig. 54, New York: Marchbanks Press.

Richter, Gisela M. A. 1956. Catalogue of Engraved Gems of the Classical Style: Greek, Etruscan, and Roman. no. 463, pp. 101–2, pl. 56, Rome: L'Erma di Bretschneider.

Bodel, John P. and Stephen Tracy. 1997. Greek and Latin Inscriptions in the USA : A Checklist. p. 194, Rome: American Academy in Rome.

Richter, Gisela M. A. 2006[1956]. Catalogue of Engraved Gems of the Classical Style: Greek, Etruscan, and Roman, 2nd edn. no. 463, pp. 101–2, pl. 56, color pl. 14, Rome: L'Erma di Bretschneider.

Zwierlein-Diehl, Erika. 2007. Antike Gemmen und ihr Nachleben. pp. 416–17, fig. 478, Berlin: Walter de Gruyter & Co.

Draper, James David. 2008. "Cameo Appearances." Bulletin of the Metropolitan Museum of Art, 65(4): p. 7, fig. 2.

Picón, Carlos A. and Seán Hemingway. 2016. Pergamon and the Hellenistic Kingdoms of the Ancient World no. 263, p. 312, New York: The Metropolitan Museum of Art.

Zanker, Paul, Seán Hemingway, Christopher S. Lightfoot, and Joan R. Mertens. 2019. Roman Art : A Guide through the Metropolitan Museum of Art's Collection. pp. 386–88, figs. 164, 165, New York: Scala Publishers.

Lapatin, Kenneth. 2021. "The Getty Gnaios : A Love Story." Journal of the History of Collections, 33: pp. 3–4, 14 n. 12, fig. 3.