This review of yellow sapphires was determined by The shortage of clarity inside the literature as towards the origin from the yellow coloration. Looking back, this uncertainty was the result of 3 aspects. Very first, the Fe3+ focus in natural stones spans a range of somewhere around 4–4750 ppma, but https://www.tumblr.com/thegemjournal/759696203354128384/understanding-the-unique-characteristics-of-yellow?source=share