This review of yellow sapphires was determined by The dearth of clarity inside the literature as to the origin from the yellow coloration. In retrospect, this uncertainty was the results of a few variables. Initial, the Fe3+ concentration in natural stones spans A variety of around 4–4750 ppma, but only https://www.tumblr.com/thegemjournal/759696203354128384/understanding-the-unique-characteristics-of-yellow?source=share