This large gem is bold and gorgeous in the light....and in the dark! The colors and dichro are amazing by themselves, just awesome...but when you turn off the lights, there's a whole nutha aspect to be seen, as all of that white glass is glow in the dark! Not UV, but glow glass, so all you need is regular light to charge it up, and then voila', it glows when the lights are turned off! The first 2 glow pics show pics that are taken in complete darkness, with only the light of the marble being picked up by the camera. In real life it is amazingly bright. Then, if you hit it with a black light, it REALLY lights up! So cool, I love this one! Signed 'BT 22'.