The Arkenstone

{s}The Arkenstone, also known as "The King's Jewel", the "Arkenstone of Thrain" and the "Heart of the Mountain", was a wondrous gem sought by Thorin Oakenshield in J. R. R. Tolkien's The Hobbit. It was discovered beneath the Lonely Mountain (Erebor) by Thorin's ancestor Thrain and shaped by the Dwarves.