The toothed setting holds a fine-colored but flawed cabochon emerald. A similar ring was found in a tomb of the late fourth century B.C. at Derveni. Emeralds first appeared in jewelry at this time and probably came from mines in the eastern Egyptian desert, though it is possible that some came from the Ural Mountains.
Said to be from near Thessaloniki
Richter, Gisela M. A. 1937. "The Ganymede Jewelry." Bulletin of the Metropolian Museum of Art, 32(12): pp. 290-2, 294, fig. 2.
Grancsay, Stephen V. 1940. "The Art of the Jeweler: A Special Exhibition." Bulletin of the Metropolitan Museum of Art, 35(11): p. 216.
von Bothmer, Dietrich and Joan R. Mertens. 1982. The Search for Alexander: Supplement to the Catalogue. no. S10, pp. 4-5, New York: The Metropolitan Museum of Art.
1994. Metropolitan Museum of Art Guide: Works of Art Selected by Philippe De Montebello. New York: The Metropolitan Museum of Art.
Williams, Dyfri and Jack Ogden. 1994. Greek Gold: Jewelry of the Classical World. no. 34, p. 79, New York: Harry N. Abrams, Inc.
Picón, Carlos A. 2007. Art of the Classical World in the Metropolitan Museum of Art: Greece, Cyprus, Etruria, Rome no. 196, pp. 170, 440, New York: The Metropolitan Museum of Art.
Picón, Carlos A. 2009. "Glass and Gold of the Hellenistic and Early Roman World." Philippe de Montebello and the Metropolitan Museum of Art: 1977-2008, James R. Houghton, ed. p. 19, New York: The Metropolitan Museum of Art.