This examine of yellow sapphires was inspired by The shortage of clarity while in the literature as on the origin in the yellow coloration. On reflection, this uncertainty was the results of 3 elements. 1st, the Fe3+ focus in natural stones spans a range of about 4–4750 ppma, but only https://www.tumblr.com/thegemjournal/759696203354128384/understanding-the-unique-characteristics-of-yellow?source=share