Genuine Byzantine / Islamic iridescent monochrome glass bead, 7-9 century

Description

Byzantine / Islamic faceted glass bead
Date: 7- 9 century
Iridescent glass
Cube with faceted corners. Translucent blue glass.
Intact, very good condition. Surface is entirely iridescent.
Height 12 mm, 12 x 10 mm
For similar published examples see:
- J. Callmer,Trade beads and bead trade in Scandinavia ca. 800-1000 A.D., 1977, pl.1: A183T
- V.Kovalevskaya, Komputernaya obrabotka massovogo arhaeologicheskogo materiala is rannesrednevekovih pamyatnikov Evrasii, Moscow, 2000, p. 20: #117