I was trying to figure out a good source of light for seeing the inner facets of crystals. I finally settled on a simple LED flashlight. I built a little contraption to hold the flashlight up and rest the crystal above.
Here are the two crystals I started with. The big one is a Citrine, and the smaller one is a smokey quartz
The exposure was kinda tricky. As you know, what looks good to the eye does not always come out the same in the picture. I had to do a little HDR here and there to get things back in range.
Here's how the smokey came out. Looks like the 4th of July in there.