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ダイヤモンドのグレーディングにおける4Cとは何ですか？
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A
カット、カラット、クラリティ、カラー
B
カラット、カット、カラー、コスト
C
カラー、クラリティ、カラット、コスト
D
カット、クラリティ、カラット、コスト
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