Chalcedony

74S
Chalcedony bead
2-3 century AD
Roman

Disc-shape with slightly convex top and bottom. Bi-conical hole, drilled from opposite ends.
Intact, very good condition. Minor ancient chips.

Max diameter: 32 mm
Height: 13 mm

For similar beads see:
-Alexeeva E.M. Antichniye busi severnogo prichernomoriya, Academy of Science, Moscow, 1978, table 37: 27