There is said to be 13 crystal skulls scattered around the world, all made with expertise and the tools beyond today's evolution. But these date back thousands or even tens of thousands of years, to ancient Mesoamerican civilizations such as the Aztec, Toltec, Mixtec or Maya.
So far 3 have been discovered
1 Clear Quartz
1 Emerald
1 Rose Quartz
Pack of 3