Optical Properties of Carnelian 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. Carnelian optical properties like luster, clarity, refractive index etc. are used to determine the non-destructive methods during gemstone identification and evaluation.
Carnelian luster is the quantity of light the crystal reflects when light is incident on it. Carnelian which is commonly found in Red color, is Translucent and Transparent to nearly opaque in nature. It possess Vitreous luster.