Apparently, the diffusion coefficient is sensitive to impurities or structural challenges in the crystal, but That continues to be to become quantified. For our tough estimates of some time at temperature required to remove the hydrogen from our samples, the hydrogen diffusion coefficient preferred is given by Belonoshko et al. https://www.tumblr.com/thegemjournal/759696203354128384/understanding-the-unique-characteristics-of-yellow?source=share