This research of yellow sapphires was determined by The dearth of clarity while in the literature as on the origin in the yellow coloration. In retrospect, this uncertainty was the results of three variables. First, the Fe3+ focus in natural stones spans a range of about four–4750 ppma, but only https://friendlybookmark.com/story18001811/considerations-to-know-about-sri-lankan-pukhraj