This analyze of yellow sapphires was inspired by the lack of clarity in the literature as to the origin with the yellow coloration. In retrospect, this uncertainty was the results of three components. 1st, the Fe3+ focus in natural stones spans A variety of about four–4750 ppma, but only concentrations https://www.tumblr.com/thegemjournal/759696203354128384/understanding-the-unique-characteristics-of-yellow?source=share