This study of yellow sapphires was determined by the lack of clarity while in the literature as to the origin from the yellow coloration. In retrospect, this uncertainty was the results of a few elements. To start with, the Fe3+ concentration in natural stones spans A selection of roughly 4–4750 https://www.tumblr.com/thegemjournal/759696203354128384/understanding-the-unique-characteristics-of-yellow?source=share