This examine of yellow sapphires was inspired by The dearth of clarity inside the literature as towards the origin from the yellow coloration. On reflection, this uncertainty was the results of a few things. 1st, the Fe3+ concentration in natural stones spans A selection of roughly four–4750 ppma, but only https://www.tumblr.com/thegemjournal/759696203354128384/understanding-the-unique-characteristics-of-yellow?source=share