The colour pink in diamonds is truly another one of nature's marvels. As opposed to the other colours in diamonds which lend their colours to trace elements, these elements are never found in pink diamonds.
The pink colour is caused by a distortion in the diamond's crystal lattice (or make up) during its violent birth over 1.58 billion years ago.
This distortion or plastic deformation was created by the intense heat and enormous pressure pushing from all directions as the stone was being forced to the earth's surface during a volcanic explosion originating deep within our earths mantle. This distortion created a flaw in the lattice work of the diamond which in turn makes the diamond refract light in the pink spectrum.