Seemingly, the diffusion coefficient is sensitive to impurities or structural difficulties while in the crystal, but that remains to be quantified. For our rough estimates of some time at temperature necessary to eliminate the hydrogen from our samples, the hydrogen diffusion coefficient decided on is always that offered by Belonoshko https://www.tumblr.com/thegemjournal/759696203354128384/understanding-the-unique-characteristics-of-yellow?source=share