, 2020). This sort of boosts in both of those peak absorption cross part and width of the 450 nm absorption band in excess of linearly increase the toughness of the chromophore with focus. Other chromophores in natural corundum do not present these improvements and therefore show a constant toughness https://www.tumblr.com/thegemjournal/759696203354128384/understanding-the-unique-characteristics-of-yellow?source=share