Dué le quartz (デュールクォーツ) was a Japanese visual kei rock band that formed in December 1998 and signed to PS Company, a sub-division of Free-Will. In December of 1998, Sakito and Ken formed Dué le quartz and played their first live on February 14, 1999. They recruited bassist Kikasa somewhere in between, then officially added KAZUKI to the mix on March 22 of that year. Ken left the band in May due to musical differences, leaving the guitarist gap to be filled by Miyavi on June 29, 1999 and complete the band's final lineup.

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