This study of yellow sapphires was enthusiastic by The shortage of clarity within the literature as into the origin in the yellow coloration. On reflection, this uncertainty was the results of 3 aspects. Very first, the Fe3+ concentration in natural stones spans A variety of somewhere around 4–4750 ppma, but https://www.tumblr.com/thegemjournal/759696203354128384/understanding-the-unique-characteristics-of-yellow?source=share