This examine of yellow sapphires was motivated by The shortage of clarity inside the literature as to the origin on the yellow coloration. Looking back, this uncertainty was the results of a few components. Initial, the Fe3+ concentration in natural stones spans A selection of approximately 4–4750 ppma, but only https://www.tumblr.com/thegemjournal/759696203354128384/understanding-the-unique-characteristics-of-yellow?source=share