Preciosa Crystal 6mm Bicone, Alexandrite AB. Beads are about 6.2mm in diameter and about 5.7mm on the drilled dimension, hole size is approximately 1mm. Also called a 69 302 Bead Rondel. Sold in packages of 24 beads.
Alexandrite is a color changing style. In certain light sources, including our picture taking setup, the beads appear a light blue color. In other lighting situations, the beads will appear a pale purple to lilac shade.
4mm round beads are formed from Alexandrite glass (pale blue in fluorescent light, pale lilac in incandescent light), then are finished with both an AB finish and a matte finish.