This may look as a simple rock but there's a real gem hidden inside.

A group of caffeine crystals around 40 microns in length.

Here’s AK-47 and some human remains made entirely from Swarovski Crystals by Nicola Bolla who is a sculptor from Italy. The rifle is an AK 47 assault weapon and the human remains include thighbones, a ribcage, and skulls. The artist wanted to show the transience of life and a brutal end of a man who died a violent death in war.