Another interesting variety of this blue sapphire is one known as "chatoyant"; this has a rapidly changing lustre, which seems to undulate between a green-yellow and a luminous blue, with a phosphorescent glow, or fire, something like that seen in the eyes of a cat in the dark, or the steady, burning glow observed when the cat is fascinating a bird-hence its name.
"The Chemistry, Properties and Tests of Precious Stones"
John Mastin
He held it up and watched the sunlight, filtering through Venus's thick clouds, and the firelight, reflected from Red Lava Range two hundred miles away, play on the chatoyant interior of the stone as if they were chasing each other.
"The Wealth of Echindul"
Noel Miller Loomis
Her luxuriant hair, which lay in careless masses about the shapely head and intelligent brow, was a mixture of red and brown and gold, a variety which never ceases to charm; skin the pallor of ancient marble, with the shadow of rose lying below the eyes, the large, gray chatoyant eyes, which answered every impulse of the brain which ruled them.
"The Puppet Crown"
Harold MacGrath