A "Fusion Dance" is a synchronized dance performed by two or more Gems in order to fuse into a Fusion Gem. Generally, the dance is composed of the dance styles of the Gems that are going to fuse. Each dance is accompanied by a unique musical theme, usually exhibiting the motifs from the respective themes of the Gems. Fusion dances are only required by Gems of differing gemstones; Gems of the same type of gemstone can fuse at will.