Iolite has a property called "pleochrism". Stones with this property appear to be different colors when shifted in light. Iolite is most commonly seen in shades of blue-gray, violet or indigo. In different light it may also appear to have shades of yellow or gray. From Tanzania.

8mm Approx. 25 on approx. 8 inch (20.32 cm) strand. (strand)