This examine of yellow sapphires was motivated by the lack of clarity inside the literature as to the origin in the yellow coloration. Looking back, this uncertainty was the results of three components. Very first, the Fe3+ focus in natural stones spans An array of about four–4750 ppma, but only https://www.tumblr.com/thegemjournal/759696203354128384/understanding-the-unique-characteristics-of-yellow?source=share