This analyze of yellow sapphires was inspired by The shortage of clarity within the literature as to your origin with the yellow coloration. On reflection, this uncertainty was the result of a few variables. First, the Fe3+ focus in natural stones spans A variety of about four–4750 ppma, but only https://www.tumblr.com/thegemjournal/759696203354128384/understanding-the-unique-characteristics-of-yellow?source=share