This analyze of yellow sapphires was enthusiastic by The shortage of clarity during the literature as to your origin with the yellow coloration. On reflection, this uncertainty was the results of 3 elements. 1st, the Fe3+ concentration in natural stones spans An array of close to four–4750 ppma, but only https://www.tumblr.com/thegemjournal/759696203354128384/understanding-the-unique-characteristics-of-yellow?source=share