A detailed replica of Joseph Smith's magical rock. This is the version without the secret message in it. Just a clean, pretty rock. If you want the one with the secret message, it's available in this link.
Smith created the Book of Mormon by putting a seer stone into a hat, then putting his face in the hat, drawing it closely around his face to exclude the light; and in the darkness the spiritual light would shine. A piece of parchment would appear in front of his eyes only, and on that appeared God's writing and the interpretation in English, which he would dictate out loud.
This replica is made based on images of the rock released by LDS.