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