"Crystal", known as "Gem" ( (ほう) (ぎょく) Hōgyoku) in Japan, is an archetype that includes the "Crystal Beast" and "Ultimate Crystal God" archetypes and their support cards. It is used in the Yu-Gi-Oh! GX anime by Jesse Anderson.

"Violet Crystal" is not a "Crystal" card because it does not have 「 (ほう) (ぎょく) 」 in its Japanese name.

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