This analyze of yellow sapphires was enthusiastic by The dearth of clarity in the literature as on the origin on the yellow coloration. In retrospect, this uncertainty was the result of 3 aspects. 1st, the Fe3+ concentration in natural stones spans A variety of around four–4750 ppma, but only concentrations https://www.tumblr.com/thegemjournal/759696203354128384/understanding-the-unique-characteristics-of-yellow?source=share