A semitransparent emerald of fine bluish green color engraved with a Severan royal portrait of either Julia Domna or Plautilla, set in its original gold ring (ring:  25.1 × 31.3 × 18.9 mm; stone: ca. 11.8 × 13.1 mm). Michael C. Carlos Museum, Emory University, gift of the Michael J. Shubin estate, inv. 2008.030.034. (Photo: Lisbet Thoresen)