Colin Murray "Gem" Archer (born 7 December 1966) is an English musician, best known as a member of the English rock band Oasis and Beady Eye. He is also known for his work with Heavy Stereo. He joined Oasis as rhythm guitarist in November 1999, and handled lead guitarist for acoustics as well. He also contributed towards the writing of some of the band's songs. Oasis broke up in August 2009, but in November 2009, Liam Gallagher announced he was writing new material with Gem as well as other ex-Oasis members minus his brother Noel, under the name Beady Eye.