This study of yellow sapphires was determined by The shortage of clarity within the literature as into the origin on the yellow coloration. Looking back, this uncertainty was the results of a few variables. 1st, the Fe3+ focus in natural stones spans a range of close to 4–4750 ppma, but https://modernbookmarks.com/story17896817/natural-pukhraj-from-sri-lanka-things-to-know-before-you-buy