This research of yellow sapphires was enthusiastic by the lack of clarity within the literature as on the origin with the yellow coloration. In retrospect, this uncertainty was the results of three aspects. 1st, the Fe3+ concentration 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