Onyx and Pearl Optical Properties

Onyx

Pearl

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Optical Properties

Luster

Pleochroism

Dispersion

Transparency

Refractive Index

Optic Character

Crystal System

Birefringence

Clarity

Vitreous

0.01

Translucent, Opaque, Translucent to opaque

1.530-1.543

Trigonal

-9999

OpaqueHerve Nicolas Lazzarelli

Pearly

0.03

Translucent, Opaque

1.52-1.66

Orthorhombic

0.156

Translucent

Onyx and Pearl Optic Character

Onyx and Pearl optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Onyx and Pearl 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 Pearl 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 Pearl Transparency

Similar to their colors, Onyx and Pearl 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 Translucent, Opaque and Translucent to opaque while Onyx is Translucent, Opaque and Translucent to opaque in appearance.