Seemingly, the diffusion coefficient is sensitive to impurities or structural problems in the crystal, but that remains for being quantified. For our tough estimates of enough time at temperature required to remove the hydrogen from our samples, the hydrogen diffusion coefficient preferred is that offered by Belonoshko et al. (2004), https://www.tumblr.com/thegemjournal/759696203354128384/understanding-the-unique-characteristics-of-yellow?source=share