The ideal atomic structure of our diamonds is perfect for research in the sphere of quantum photonics and optics. The spin of the electron in the Hydray center (an atomic level defect in a diamond) was proved to be effective media storage for information and quantum computing. Type IIa diamonds with low-dislocation level and without impurities and contaminations are one of the most perspective solutions in this sphere. Although this technology is still in at a development stage, there is no doubt that such material as diamond will play very important part in quantum research.