Evidently, the diffusion coefficient is sensitive to impurities or structural problems within the crystal, but that remains being quantified. For our tough estimates of enough time at temperature necessary to get rid of the hydrogen from our samples, the hydrogen diffusion coefficient picked is that presented by Belonoshko et al. https://www.tumblr.com/thegemjournal/759696203354128384/understanding-the-unique-characteristics-of-yellow?source=share