A large red gem in a pendant, this is initially thought to be one of Oberon's tools that can be used to control the weather in Amber. In "The Guns of Avalon", Eric uses it to summon storms against the dark forces attacking Amber, but is mortally injured. After Corwin's forces annihilate the attackers, Eric reveals that he became attuned to the Jewel by walking the Pattern in Amber and then projecting himself into its core. Corwin does this, and discovers other effects, such as a sapping of his energies and a tendency for time to slow down. The Jewel saves his life when he is stabbed in Amber, projecting him back to his old home on Earth where he lived as Carl Corey. Dworkin finally reveals that the Jewel contains within it the original Pattern from which he created Amber. Corwin, fearing that Amber has been destroyed in "The Courts of Chaos", repeats this process in Shadow to create his own Pattern, using its power to project him to the Courts where he witnesses the final battle against Chaos and Brand, who took the Jewel while he was incapacitated after creating his Pattern. Apparently lost during the battle when Brand falls into the abyss, the Jewel is returned by the Unicorn and given to Random, making him the new King in Amber.