Iolite faceted rondelles measure approximately 2.5mm to 3mm in diameter, have a vitreous luster, beads are well facted and polished, bead shapes are symmetrical machine cuts, and there are visible internal characteristics in this beautiful violetish blue stone. Iolite reveals different colors from different directions of view to show a pleochroic palette of grey, light blue and violetish dark blue hues.