This research of yellow sapphires was motivated by The dearth of clarity during the literature as to your origin in the yellow coloration. On reflection, this uncertainty was the result of 3 elements. 1st, the Fe3+ concentration in natural stones spans A variety of about four–4750 ppma, but only concentrations https://www.tumblr.com/thegemjournal/759696203354128384/understanding-the-unique-characteristics-of-yellow?source=share