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Peridot
Peridot

Dioptase
Dioptase



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Peridot
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Dioptase

Peridot and Dioptase Optical Properties

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Optical Properties

Luster

Vitreous, Greasy
Vitreous

Pleochroism

Weak: yellow-green green (colorless)Herve Nicolas Lazzarelli
Weak; dark emerald green

Dispersion

0.020.04
0.005 1
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Transparency

Transparent
TranslucentHerve Nicolas Lazzarelli

Refractive Index

1.64-1.691.644-1.720
1 3.25
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Optic Character

-
-

Crystal System

Orthorhombic
Trigonal

Birefringence

0.0360.051-0.053
0 0.296
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Clarity

Transparent
TranslucentHerve Nicolas Lazzarelli

Peridot and Dioptase Optic Character

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

Peridot and Dioptase Transparency

Similar to their colors, Peridot and Dioptase 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, Peridot is Transparent while Peridot is Transparent in appearance.