Diamond is the debut Japanese studio album by South Korean girl group 4Minute.

The limited edition includes a 52-page photo book that highlights some of the group's single releases and Japanese debuts.

[3] A Japanese version of the song "Muzik" was released on May 5, 2010 as the first single for Diamond.

The Japanese version reached number 21 on the Oricon Singles Chart,[4] selling 8,234 copies.

[7] The third and last single from the album is "First", which was released on October 27, 2010 as a double A-side with the non-album track "Dreams Comes True."