Detection crystals are items that are used to detect a djinn's use of Djinn power. Most often, they are used in Djinnverso tournaments where they stop a person from cheating. It is contained inside special crystal box, made of fluorite (which can be easily mistaken for lechatelierite, a cheap, non-crystalline mineral that possesses no fluorescent or thermo-luminescent qualities whatsoever, but still feels like fluorite- remember, a djinn is made of fire, and that is what makes the fluorite light up), that is designed both to conceal a player's throw and to detect the illegal use of djinn power; thus, overcome by the player's ability to bluff his or her opponents. Any player found to be using djinn power is immediately expelled from a game.

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