When in human form, Soul Gems can be held, but they can also take the form of rings with the series' trademark runes on it. One of the girl's fingernails also gets a simple pattern put on it. Each Soul Gem has a unique appearance depending on the Puella Magi it belongs to. The basic shape is the same, but the color of the gem depends on the main color of the Puella Magi's transformed outfit and on the top of the Soul Gem is a symbol or shape different for each girl. In Puella Magi form, the Soul Gem manifests itself as a piece of jewelry (like a hair clip or broach) on the girl's costume, in a form similar to the shape on the top of the Soul Gem.