This analyze of yellow sapphires was inspired by The shortage of clarity within the literature as for the origin of the yellow coloration. Looking back, this uncertainty was the result of a few factors. Initial, the Fe3+ focus in natural stones spans An array of around 4–4750 ppma, but only https://www.tumblr.com/thegemjournal/759696203354128384/understanding-the-unique-characteristics-of-yellow?source=share