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Diamond Domain (Japanese: ダイヤモンド鉱国 Diamond Ore Country) is is an anime-exclusive location in Kalos. It is the setting of Diancie and the Cocoon of Destruction.
It is a beautiful, underground domain where Carbink live in peace and Diancie serves as its ruler. The Heart Diamond is a large diamond created by Diancie, which is used to sustain the land.