A Bactrian agate 'magical eye' bead., Early 1st millenium B.C.
22 x 38 x 13 mm.
The long convex oval stone is a three-layers agate also call « eye bead » since the natural layers of the stone reminds an eye with apotropaic power. Parallel: for a similar bead see Christie’s NY, December 6th 2007, lot 466