This review of yellow sapphires was enthusiastic by The shortage of clarity in the literature as on the origin of the yellow coloration. Looking back, this uncertainty was the result of 3 aspects. Very first, the Fe3+ focus in natural stones spans An array of somewhere around four–4750 ppma, but https://www.tumblr.com/thegemjournal/759696203354128384/understanding-the-unique-characteristics-of-yellow?source=share