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