FYI -- Doping pure diamonds with nitrogen to get quantum dots. Very, very cool, although I suspect that one could also get interesting properties with C12/C13 doping. http://www.theregister.co.uk/2016/06/09/nanomaterials_quantum_dots/ Boffins slap quantum dots on diamonds to create mutant nanomaterials Researchers have found a new way to speed up the process of doping nanomaterials by adding quantum dots to tiny diamonds, which could advance electronics and quantum computing in the future, according to a paper published in Nature Communications. Pure diamonds are rare, expensive, and have a rigid structure made out of carbon atoms. To make the doping process cheaper, researchers artificially produced the diamonds and inserted nitrogen atoms inside. The nitrogen is an impurity, breaking up the diamondÂs perfect carbon structure. It replaces one carbon atom in that structure with a nitrogen atom, and leaves an empty space where another carbon would normally be  also known as a nitrogen vacancy. http://www.nature.com/ncomms/2016/160608/ncomms11820/full/ncomms11820.html Nanodiamond-based nanostructures for coupling nitrogen-vacancy centres to metal nanoparticles and semiconductor quantum dots http://www.nature.com/ncomms/2016/160608/ncomms11820/pdf/ncomms11820.pdf