This review of yellow sapphires was inspired by The dearth of clarity inside the literature as towards the origin on the yellow coloration. On reflection, this uncertainty was the result of three aspects. Initial, the Fe3+ concentration in natural stones spans A variety of roughly four–4750 ppma, but only concentrations https://www.tumblr.com/thegemjournal/759696203354128384/understanding-the-unique-characteristics-of-yellow?source=share