Crystal Brooch

Crystal Brooch (クリスタルブローチ Kurisutaru Burōchi) is a brooch-like device that allows Yumehara Kibo, Natsuki Jounetsu, Kasugano Kaori, Akimoto Hiromi and Minazuki Kelly to transform into Pretty Cure.

The Crystal Brooches are also halves of the Crystals of the Mirror Kingdom, while the Cures are the other halves. It is said that when one half of a Crystal joins with the other half, a miracle occurs.

Trivia

 * The miracle that occurs is most likely when a Dark Cure is revived and becomes a Pretty Cure.