Diamonds is the eighth studio album by Japanese pop band Deen. It was released on 18 August 2006 under BMG Funhouse.
From this album they moved from sub-label to main label, BMG Japan. Diamonds was released two years after Deen's previous album Road Cruisin'.
The album consists of two previously released singles, Starting Over and Diamond.
For the first time, the composer Kouji Yamane performed by himself his own written song Shanghai Rock Star. For the first time after eight years, some staff from Being Inc. were involved in album production, such as Tetsurà  Oda and Takeshi Hayama.
This album was released in two formats: regular CD edition and limited CD+DVD edition. In DVD disc are included videoclips of the singles "Diamond".
The album reached #20 in its first week and charted for 3 weeks, selling 10,000 copies.