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Information in this article may not be canonical to the storyline of the games or any other Sonic continuity.
The Moon Emerald is a large white emerald from space that is partially encased in a meteorite.
The Moon Emerald was stolen from a museum by the Rogue Rouge under orders from Dr. Eggman, who later used it alongside the Master Emerald to power one of his robots. Following the robot's defeat though, both Emeralds were reclaimed by their rightful owners.