This research of yellow sapphires was determined by the lack of clarity within the literature as for the origin in the yellow coloration. On reflection, this uncertainty was the results of a few factors. Initially, the Fe3+ focus in natural stones spans A variety of close to four–4750 ppma, but https://www.tumblr.com/thegemjournal/759696203354128384/understanding-the-unique-characteristics-of-yellow?source=share