This research of yellow sapphires was inspired by The dearth of clarity from the literature as on the origin of your yellow coloration. On reflection, this uncertainty was the result of 3 components. Initially, the Fe3+ concentration in natural stones spans A selection of about four–4750 ppma, but only concentrations https://www.tumblr.com/thegemjournal/759696203354128384/understanding-the-unique-characteristics-of-yellow?source=share