Seemingly, the diffusion coefficient is delicate to impurities or structural problems during the crystal, but That continues to be being quantified. For our tough estimates of time at temperature required to remove the hydrogen from our samples, the hydrogen diffusion coefficient decided on is given by Belonoshko et al. (2004), https://sitesrow.com/story7864889/detailed-notes-on-natural-yellow-sapphire-from-sri-lanka