Byzantine / Islamic mosaic glass bead
Date: 7- 9 century
Mosaic glass

Bead's matrix is made up of sections of premanufactured mosaic cane, consisted of concentric blue, white, red with yellow center. 
Intact, good condition.

Height 11 mm, diameter 11 mm

For published similar beads see:

-  A.Panini, Middle Eastern and Venetian Glass Beads, Skira, 2007, p. 52 #51, p. 58 #80