Optical reflectance effect

Falcon, hawk’s cat’s eye, or blue tiger’s eye refers to a blue to bluish-grayish, semi-precious, inexpensive, chatoyant quartz gemstone formed by the intergrowth of subparallel

Tiger’s eye (pseudocrocidolite, tiger eye, or tigereye) is a golden-yellow to golden-brown to reddish-brown attractive, popular, yet inexpensive gemstone that exhibits chatoyancy due to the

Chatoyancy or chatoyance (pronounced shə-TOY-ən-see) in gemology is a mystical optical phenomenon also known as the cat’s eye effect displayed by some stones (minerals, gemstones,

A cat’s eye gemstone or mineral reflects a narrow, concentrated, sharp band of light movable on the convex surface of appropriately cut en cabochon as