Seemingly, the diffusion coefficient is sensitive to impurities or structural challenges while in the crystal, but that remains to get quantified. For our tough estimates of some time at temperature required to remove the hydrogen from our samples, the hydrogen diffusion coefficient selected is that presented by Belonoshko et al. https://www.tumblr.com/thegemjournal/759696203354128384/understanding-the-unique-characteristics-of-yellow?source=share