Seemingly, the diffusion coefficient is sensitive to impurities or structural issues during the crystal, but that remains to be quantified. For our rough estimates of enough time at temperature required to remove the hydrogen from our samples, the hydrogen diffusion coefficient preferred is always that provided by Belonoshko et al. https://www.tumblr.com/thegemjournal/759696203354128384/understanding-the-unique-characteristics-of-yellow?source=share