This analyze of yellow sapphires was enthusiastic by The shortage of clarity within the literature as to the origin from the yellow coloration. Looking back, this uncertainty was the result of 3 aspects. Initially, the Fe3+ concentration in natural stones spans A selection of somewhere around four–4750 ppma, but only https://www.tumblr.com/thegemjournal/759696203354128384/understanding-the-unique-characteristics-of-yellow?source=share