CVD diamonds grow from an HPHT grown diamond seed crystal. Carbon rains down from a plasma cloud and deposits on to the seed crystal, escalating diamond in layers. But with the CVD procedure, a few of that hydrogen will get converted to atomic hydrogen. Atomic hydrogen supplies the ideal environment https://zanefoxgn.onesmablog.com/5-essential-elements-for-lab-grown-diamonds-are-the-future-67529727