The Power Diamond, also known as the Super Diamond or Power Crystal, is an item that needs to be obtained to transform Mario into Diamond Mario.
This item makes its debut in this game as a power-up needed to transform Mario into Diamond Mario. It is overall rare and is only found in underground or cave-related levels.
In this game, the item makes another appearances, acting and looking the same as in Super Mario 3D: Magic Orb Legacy. However, in this game, it is called the Super Diamond.
In this game, the Power Diamond appears as the logo for the Diamond Cup.
In this game, it acts and is completely the same as in Super Mario Crystalline World.
The Power Diamond's typical appearance.