"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.

"Counter Gem" and "Violet Crystal" are not "Crystal" cards, because they does not have 「 (ほう) (ぎょく) 」 in their Japanese names.

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