The Power Gems, also called the Power Stones, are 7 green, energized minerals similar to the Chaos Emeralds found on Mobius. Properties of these precious jewels include increased all around powers such as the ability to increase the size of objects, and the ability to upgrade or power machines. Supposedly, it is one of the rarest occurring natural elements, second only to the Chaos Emeralds. Unlike the Chaos Emeralds, however, the Power Gems were produced artificially by Dr. Ivo Robotnik himself.