Ruby and Danburite Optical Properties

Ruby

Danburite

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Optical Properties

Luster

Vitreous, Adamantine

Vitreous, Greasy

Pleochroism

Strong: purplish-red

Weak: pale yellow yellow

Dispersion

0.020.02

0.005 1

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Transparency

Transparent, Translucent, Transparent to opaque

Refractive Index

1.762-1.7781.627-1.639

1 3.25

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Optic Character

Biaxial/+

Crystal System

Trigonal

Orthorhombic

Birefringence

0.0080.006

0 0.296

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Clarity

Transparent

TransparentUlrich Henn and Claudio C. Milisenda

Ruby and Danburite Optic Character

Ruby and Danburite optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Ruby and Danburite 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 Danburite 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. Danburite has Biaxial/+ character.

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Ruby and Danburite Transparency

Similar to their colors, Ruby and Danburite 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.