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