This is some fun and easy photography you can do at home with just cell phone cameras. We turned on the flashlight on one of our phones and put a crystal on top. We turned the lights off and went under some furniture for as much darkness as possible.
Then you can simply adjust your camera settings until the crystal shows detail and is well lit. The result is a floating crystal on a black background!
From there you can make some simple edits to polish off the image.