Seemingly, the diffusion coefficient is sensitive to impurities or structural problems inside the crystal, but that remains to generally be quantified. For our rough estimates of some time at temperature required to take out the hydrogen from our samples, the hydrogen diffusion coefficient chosen is usually that given by Belonoshko https://www.tumblr.com/thegemjournal/759696203354128384/understanding-the-unique-characteristics-of-yellow?source=share