This article is about a/an monster in Choujin Sentai Jetman.

Diamond Jigen (ダイヤジゲン Daiyajigen, 8,27): The result of Maria's Dimensional Bug assimilating into the Bloody Diamond, a 20 billion yen jewel said to be cursed, Diamond Jigen is used to inflict people with insane greed-filled rage. Once in full monster form, Diamond Jigen uses its power to turn Ako Hayasaka into a crazed psycho, forcing the male members of the team to attack the monster without her and Kaori, who manages to snap Ako out of it with every piece of jewelry she manages to buy with her family's fortune. Once the female members arrives, the Jetman use the Icarus Haken's Jet Phoenix to crack Diamond Jigen, breaking its curse.

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