"Rough Cut Diamond" (ラフカット ダイアモンド, Rafukutto Daiamondo) is MAX's 31st single under the Sonic Groove label.

The title track was used as the theme song for TV Tokyo drama, Kariyushi Sensei Chibaru.

[2] Media reports announcing a tie-in between MAX and the drama series Kariyushi Sensei Chibaru revealed the title of one of the songs included on the single to be "Rough Cut Diamond".

[4] On May 30, 2009, the group performed "Rough Cut Diamond" for the first time at the final date of their tour at Kanagawa Kenmin Hall.

The group held several promotional events for the single in Chiba and Osaka where fans could come and watch a free mini concert.