, 2020). These types of raises in the two peak absorption cross segment and width with the 450 nm absorption band greater than linearly raise the toughness from the chromophore with concentration. Other chromophores in natural corundum usually do not clearly show these changes and so exhibit a continuing toughness https://www.tumblr.com/thegemjournal/759696203354128384/understanding-the-unique-characteristics-of-yellow?source=share