Iolite facet rough from Babati, Tanzania!

A mix of blue and grey facing stones. Iolite exhibits pleochroism, which means it absorbs varying wavelengths of light based on the angle of incoming rays or their polarization plane. As a result, the gemstone showcases different hues depending on the viewing angle. When rotated, this Iolite reveals a spectrum of colors spanning from deep oceanic blue to a cool grey. 

Have a look at the gemstone we had cut from this material for Gem Dragon Auctions They always do quite well 

Stones range from 1-2 grams / 5 - 10 carats each

5 gram minimum