Arkenstone

The Arkenstone or "King's Jewel" was a beautiful stone that was discovered by Thrain I after Erebor had been established. The Arkenstone was shaped into a shimmering multi-faceted jewel by the Dwarfs and inspired awe in all those who bore it. The heart of the mountain became an heirloom of the King's of Durin's Folk until Thorin Oakenshield's death. The stone was then buried with him and did not pass on to future kings of Durin's Folk.