Ultima Pearls were uncommon, silvery, lustrous, spherical pearls found on the deep ocean floor of Dac, that could be used as a form of lightsaber crystal. It required considerable skill to properly install an Ultima Pearl. Jedi Master Cilghal used an ultima-pearl in her lightsaber.
- Star Wars: Knights of the Old Republic II: The Sith Lords (First appearance)
- Young Jedi Knights: Lightsabers (First mentioned)