Optical Properties of Emerald are its behavioral responses towards light. While few optical properties can be identified with naked eyes, other require special instruments by the gemologists to identify them. Emerald optical properties like luster, clarity, refractive index etc. are used to determine the non-destructive methods during gemstone identification and evaluation.
Emerald luster is the quantity of light the crystal reflects when light is incident on it. Emerald which is commonly found in Green, Green, Blue, Yellow, Grey color, is Translucent, Transparent and Transparent to translucent in nature. It possess Vitreous luster.