This study of yellow sapphires was inspired by the lack of clarity while in the literature as into the origin of your yellow coloration. On reflection, this uncertainty was the result of 3 components. Very first, the Fe3+ focus in natural stones spans An array of around four–4750 ppma, but https://www.tumblr.com/thegemjournal/759696203354128384/understanding-the-unique-characteristics-of-yellow?source=share