irregular: 7.8 cm (3 1/16 in.)
Terracotta
RomanMarble
2nd century CERomanTerracotta
RomanMarble
3rd-4th century CERomanLapis lazuli (?)
1st-3rd century CERomanParian marble
1st-2nd century CERomanMarble
3rd-4th century CERomanMarble from Asia Minor (?)
3rd century CERomanMarble
3rd century CERomanTerracotta
RomanMixed copper alloy
2nd-3rd century CERomanLuna marble
1st-3rd century CERoman