Ruby and Bertrandite Optical Properties

Ruby

Bertrandite

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Optical Properties

Luster

Vitreous, Adamantine

Vitreous

Pleochroism

Strong: purplish-red

none.

Dispersion

0.020.01

0.005 1

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Transparency

Transparent, Translucent, Transparent to opaque

TransparentAnthony et al

Refractive Index

1.762-1.7781.583-1.614

1 3.25

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Optic Character

Crystal System

Trigonal

Orthorhombic Pyramidal H-M Symbol (mm2) Space Group: Ccm21

Birefringence

0.008-9999

0 0.296

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Clarity

Transparent

TransparentAnthony et al

Ruby and Bertrandite Optic Character

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

Similar to their colors, Ruby and Bertrandite 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, Ruby is Transparent, Translucent and Transparent to opaque while Ruby is Transparent, Translucent and Transparent to opaque in appearance.