I only read about it something like 10 years ago, when lab-grown started to appear, and they already had the problem of being too pure. Making diamonds with imp

I only read about it something like 10 years ago, when lab-grown started to appear, and they already had the problem of being too pure. Making diamonds with impurities seems to be more costly than making them pure. What may fool your intuition is that the process is not about refining, it is about growing a crystal. IIRC, the vaporize carbon in a very controlled atmosphere and let it grow. Natural processes are much more messy and are made in the presence of a lot of other chemicals that need to be artificially introduced in the crystal growing atmosphere for it to be integrated.