This research of yellow sapphires was motivated by the lack of clarity during the literature as on the origin on the yellow coloration. On reflection, this uncertainty was the results of a few factors. To start with, the Fe3+ focus in natural stones spans A variety of approximately four–4750 ppma, https://www.tumblr.com/thegemjournal/759696203354128384/understanding-the-unique-characteristics-of-yellow?source=share