Onyx and Emerald Optical Properties

Onyx

Emerald

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1 Optical Properties

1.1 Luster

Vitreous

1.2 Pleochroism

Not Available

Strong dichroism: yellow green Lazzarelli

1.3 Dispersion

NA0.01

0.007 1

1.4 Transparency

Translucent, Opaque, Translucent to opaque

Transparent, Translucent, Transparent to translucent

1.5 Refractive Index

1.530-1.5431.565-1.602

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Trigonal

Hexagonal

1.8 Birefringence

Not Available0.0040-0.0070

0 0.296

1.9 Clarity

OpaqueHerve Nicolas Lazzarelli

Color grading system

Onyx and Emerald Optic Character

Onyx and Emerald optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Onyx and Emerald Physical Properties like crystallographic symmetry, pleochroism,etc. in the crystal. Some of the optical properties are refractive index, luster, optic character, pleochroism etc. Prominent among these is Onyx and Emerald optic character. You might have noticed your gemologist rotating the gemstone while testing it. Rotating a gemstone along its optic axis helps in determining its optic character.

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Onyx and Emerald Transparency

Similar to their colors, Onyx and Emerald transparency can also be used as criteria for their primary identification. Although transparency cannot be the only criteria for gemstone identification, it can efficiently used in gemstone grading. Talking about their transparency, Onyx is Opaque, Translucent and Translucent to opaque while Onyx is Opaque, Translucent and Translucent to opaque in appearance.