Chalcedony

66S
Chalcedony bead
1-2 century AD
Roman or Parthian

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

Max diameter: 26 mm
Height: 17 mm

For similar beads see:
-Alexeeva E.M. Antichniye busi severnogo prichernomoriya, Academy of Science, Moscow, 1978, table 37: 12