This review of yellow sapphires was inspired by the lack of clarity within the literature as for the origin from the yellow coloration. In retrospect, this uncertainty was the results of 3 things. Very first, the Fe3+ focus 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