Seemingly, the diffusion coefficient is sensitive to impurities or structural concerns inside the crystal, but That is still being quantified. For our tough estimates of time at temperature needed to clear away 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