This research of yellow sapphires was determined by The dearth of clarity within the literature as into the origin in the yellow coloration. Looking back, this uncertainty was the result of a few aspects. To start with, the Fe3+ concentration in natural stones spans A variety of about four–4750 ppma, https://wavesocialmedia.com/story3582143/natural-pukhraj-from-sri-lanka-things-to-know-before-you-buy