Depending on what range of colour is absorbed or radiated, creates the resulting colour. Almost all diamonds contain atoms of other elements. Atoms of nitrogen are most common and they cause a yellow colouring that we can see (e.g. it absorbs the blue spectrum). Boron causes a blue colouring (absorbs the yellow spectrum). Other colour alternations are caused by different mechanisms, for instance by deformation of the crystalline lattice – pink diamonds, or radiation – green diamonds etc. Diamonds without any other element are completely colourless.