This analyze of yellow sapphires was determined by the lack of clarity while in the literature as into the origin of your yellow coloration. Looking back, this uncertainty was the result of 3 variables. Initially, the Fe3+ concentration in natural stones spans a range of close to 4–4750 ppma, but https://livebookmarking.com/story18034951/detailed-notes-on-natural-yellow-sapphire-from-sri-lanka