Earrings like these are found throughout the Byzantine world.
Found near Assiut, Egypt (?); [ Maurice Nahman, Cairo (sold 1912)]; J. Pierpont Morgan, London and New York (1912–1913)
Dennison, Walter. "A Gold Treasure of the Late Roman Period from Egypt." In Studies in East Christian and Roman Art. Humanistic Series, Vol. 12, part 2. London and New York: University of Michigan Studies-Humanistic Series, 1918. no. 16, 17, p. 151, fig. XLI.
Wagner de Kertesz, Margarita. Historia Universal de las Joyas. Buenos Aires: Ediciones Centurion, 1947. p. 269.
Weitzmann, Kurt, ed. Age of Spirituality: Late Antique and Early Christian Art, Third to Seventh Century. New York: The Metropolitan Museum of Art, 1979. no. 306, pp. 327-328.
Brown, Katharine R., Dafydd Kidd, and Charles T. Little, ed. From Attila to Charlemagne: Arts of the Early Medieval Period in the Metropolitan Museum of Art. New York and New Haven: The Metropolitan Museum of Art, 2000. p. 62, 341, fig. 7.4.