Seemingly, the diffusion coefficient is delicate to impurities or structural difficulties from the crystal, but that remains to generally be quantified. For our rough estimates of the time at temperature necessary to eliminate the hydrogen from our samples, the hydrogen diffusion coefficient picked is supplied by Belonoshko et al. (2004), https://www.tumblr.com/thegemjournal/759696203354128384/understanding-the-unique-characteristics-of-yellow?source=share