Ancient glass beads: genuine ancient Roman chalcedony necklace 2-3 century

Description

Ancient chalcedony necklace
2-3 century AD
Roman or Parthian
Composed of 9 large compressed spherical ancient chalcedony beads, all graduated in size. Interspersed with ten modern Turk's head knots.
Each bead has a large bi-conical hole.
Max diameter of the largest bead: 32 mm,
Height: 22 mm.
Necklace is 20" ( 50.8 cm) long
For similar beads and necklaces see:
-Alexeeva E.M. Antichniye busi severnogo prichernomoriya, Academy of Science, Moscow, 1978, table 37: 14
-Christie's, New York, 5 December 2001, lot 98
-Christie's, New York, 6 December 2007, lot 434