Amethyst is one of the most common crystals in the world, but the most prized pieces can cost almost a million dollars. Some of the world’s largest amethyst geodes come from Artigas, Uruguay. The land beneath this region is exceptionally suitable for producing amethyst. But beyond size, what characteristics do miners look for in a precious amethyst? How are crystals prepared after being removed from the ground? We investigated why amethyst geodes are so expensive.