The Gazelle is one of Adidas' most popular sneakers: released in 1972, it is a training shoe that was released to coincide with the 1972 Munich Summer Olympics. The shoe traditionally comes with a pigskin nubuck upper and leather overlays (three stripes and a heel tab); although modern versions of the shoe come with synthetic overlays. The pigskin nubuck upper is dyed one colour, and the overlays come in another colour, combining to make a two tone colourway; although some may classify it as a three-tone colourway due to the Gazelle lettering coming in gold foil. Traditionally, the overlays of the Gazelle are white, but with later leather versions of the Gazelle, the upper is leather and the overlays suede; with the suede overlays coming in a range of colours.
Therefore, I will separate the Gazelle into two versions: a pigskin nubuck and leather version; admittedly, there are further versions of the Gazelle, such as the OG (Original), but that would complicate matters furthers. Therefore, you can currently find the Gazelle in the following colours (two-tone colourways with gold foil letttering).
Gazelle (Nubuck): red/white, black/white, violet/white, orange/white, grey/white, yellow/white, purple/white, vapour steel/white, pink/white, skyblue/white, collegiateroyal/white, collegiatenavy/white, scarlet/white, offwhite/white
Gazelle (Leather): white/green, white/gold, white/white, black/black, offwhite/vapourgreen, black/pink, white/blue