Chrysoberyl (Cat's-Eye) Classification
Yellow To Yellowish Green, Grayish Green, Brown To Brownish Yellow
refractive index, specific gravity, appearance and spectrum. Spectrum should reflect a strong diagnostic band at 444nm.
Phenomenal chrysoberyl may exhibit chatoyancy, in which case it is classified as "cat's-eye chrysoberyl." Cymophane will show a broad sheen instead of a distinct cat's-eye. Most often seen with yellowish green to orangy yellow background with strong silvery white cat's-eye.Cat's-eye chrysoberyl is the only chatoyant stone allowed to be called by only the name cat's-eye. Rare stones might show 4 rayed stars.