This analyze of yellow sapphires was inspired by The shortage of clarity inside the literature as to the origin with the yellow coloration. On reflection, this uncertainty was the result of three aspects. Very first, the Fe3+ focus in natural stones spans a range of somewhere around four–4750 ppma, but https://www.tumblr.com/thegemjournal/759696203354128384/understanding-the-unique-characteristics-of-yellow?source=share