Plasma ring stone
Object type: Intaglio
Department: Greek and Roman Art
Culture: Roman
Period: Imperial
Medium: Plasma
Dimensions: Other: 5/16 x 3/8 x 1/8 in. (0.8 x 1 x 0.3 cm)
Classification: Gems
Credit line: Gift of John Taylor Johnston, 1881
Accession year: 1881