The Master Emerald

The Master Emerald is a large, green emerald depicted in theSonic the Hedgehog series. A mystical relic from the untold past, the Master Emerald is a prominent object in the world due to its enormously powerful properties and its ability to control the Chaos Emeralds. It rests on Angel Island where its power keeps the island floating in the sky. Over the millennia, the Master Emerald has been guarded by the surviving Echidnas of the Knuckles Clan, with its current guardian being Knuckles the Echidna.