Fire Gem is a usable item that deals fire damage to all enemies. Twenty Fire Gems can be used to customize the Fire Eater ability to armor, while four can be used to customize Firaga as an aeon ability. They can be stolen from Bomb Kings, Flame Flan, Grenade or Puroboros, and bribed Bombs (at Home) or Flame Flans. Fire Gems can also be used in various Mixes.