JRR Tolkien/Rings of Power

Magic rings forged by Sauron in the fire of the [Crack of Doom]?.

On [the one ring]?, there is the following invisible inscription:

          Three rings for the Elven-Kings under the sky,
          Seven for the Dwarf-Lords in their halls of stone,
          Nine for Mortal Men doomed to die.
          One for the Dark Lord on his dark throne
          In the Land of Mordor where the Shadows lie.
          One Ring to rule them all, One ring to find them,
          One Ring to bring them all and in the darkness bind them
          In the Land of Mordor where the Shadows lie. 

In The Fellowship of the Ring, Gandalf? demonstrates the inscription to Frodo Baggins by throwing the ring in the fireplace to make the inscription appear in fiery letters.