Evidently, the diffusion coefficient is sensitive to impurities or structural difficulties inside the crystal, but That is still to become quantified. For our rough estimates of some time at temperature needed to remove the hydrogen from our samples, the hydrogen diffusion coefficient chosen is given by Belonoshko et al. (2004), https://www.tumblr.com/thegemjournal/759696203354128384/understanding-the-unique-characteristics-of-yellow?source=share