Annealing is an important step in semiconductor fabrication. The doping of silicon crystals is done by ion implantation which creates a lot of defects in the crystal lattice. Heating the crystals for a while enables atoms to relocate to heal the defects.
However, diamonds are thermodynamically unstable compared to graphite. Does that mean if we heat the diamond crystals, carbon atoms will preferentially rearrange into graphite structure?
