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