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Pyrope
Pyrope

Iolite
Iolite



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Pyrope
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Iolite

Pyrope and Iolite Optical Properties

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Optical Properties

Luster

Greasy, Vitreous
Vitreous

Pleochroism

None
-

Dispersion

0.020.02
0.005 1
👆🏻

Transparency

-
Transparent, Translucent, Transparent to translucent

Refractive Index

1.720-1.7561.52-1.56
1 3.25
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Optic Character

-
-

Crystal System

cubic
Orthorhombic

Birefringence

-9999-9999
0 0.296
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Clarity

TransparentUlrich Henn and Claudio C. Milisenda
Transparent to translucent

Pyrope and Iolite Optic Character

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

Pyrope and Iolite Transparency

Similar to their colors, Pyrope and Iolite 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, Pyrope is while Pyrope is in appearance.