Chalcedony

75S
Chalcedony bead
2-3 century AD
Roman or Parthian

Compressed spherical. Large bi-conical hole, drilled from opposite ends.
Intact, very good condition.

Max diameter: 21 mm
Height: 16 mm

For similar beads see:
-Alexeeva E.M. Antichniye busi severnogo prichernomoriya, Academy of Science, Moscow, 1978, table 37: 9