The Chaos Emeralds are seven magical gemstones that contain nigh-limitless power. They are found on the Floating Island and are protected by Knuckles the Echidna. Each Emerald has a different colour: green, blue, yellow, orange, red, purple and grey. Why they aren't all green as normal emeralds are is unknown.
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They are seven ancient emeralds and mystical relics tied to the Master Emerald that possess powerful properties and abilities. Those that hold the Chaos Emeralds can use their powers for a variety of things, such as initiating a super transformation , powering machines, and warping time and space. Anyone who combines all seven Chaos Emeralds can control unimaginable power. Throughout history, the Chaos Emeralds have been the center of countless world-threatening conflicts and have been targeted by multiple factions on both earth and beyond , who seek them for their near-limitless powers.