宝石の国 is a melancholic, low-energy track by 藤澤慶昌 from TVアニメ『宝石の国』オリジナルサウンドトラック, released January 17, 2018. It runs 5:36 at 140 テンポ (280 テンポ double-time) in B♭ Major (Camelot 6B).

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