These small battery powered lights are cast in glow in the dark, translucent urethane.

The black cluster with red flake comes with a small LED tealight that can be set to flicker like a candle, flash or have a steady glow. It is turned on with a button at the top of the tealight itself and is then snugly placed into the crystal. You can also use a remote control for these lights if you want more convenience ( buy it here) .

Both crystals have a really cool reflective red flake infused inside!

When these lights are charged with UV /sunlight they will glow a BRIGHT purple. You could hang these lights from your ceiling, have them on a book shelf or desktop. The RED crystal is on the left in the glow picture and the BLACK is on the right in the glow picture.

 Each one has a wool base.

The Quartz clusters are just over 4.5" tall.