Stratiefied eye

215EA
Large stratified eye bead
4 century BC
Mediterranean or Persia

Diameter 3.7 cm
Height    2.3 cm

Matrix is intact, some loses of the eye's centers
Necklace featured on the cover of Louvre Museum collection (by Nenna, see below) consists from this particular type of beads.

For similar beads see:
-Kunter K. Glasperlen der vorromischen Eisenzeit IV. Schichtaugenperlen. Marburger Studien, 1995, taf. 5: 20, 21
-Spaer M., Ancient Glass in the Israel Museum. Beads and other small objects. Israel Museum, Jerusalem, 2001, pl. 8: 102
-Véronique Arveiller-Dulong, Marie-Dominique Nenna.  Les Verres antiques du Musée du Louvre III : Parure, instruments et éléments d’incrustation, Paris, Éditions du Louvre, Somogy, 2011, p. 150.