This study of yellow sapphires was motivated by the lack of clarity in the literature as into the origin of the yellow coloration. In retrospect, this uncertainty was the results of 3 factors. 1st, the Fe3+ focus in natural stones spans An array of around four–4750 ppma, but only concentrations https://bookmark-vip.com/story18145139/the-ultimate-guide-to-natural-pukhraj-from-sri-lanka