This review of yellow sapphires was determined by The shortage of clarity while in the literature as for the origin of your yellow coloration. On reflection, this uncertainty was the result of a few elements. Very first, the Fe3+ concentration in natural stones spans A variety of close to 4–4750 https://www.tumblr.com/thegemjournal/759696203354128384/understanding-the-unique-characteristics-of-yellow?source=share