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Peridot
Peridot

Amethyst
Amethyst



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Peridot
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Amethyst

Peridot and Amethyst Optical Properties

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Optical Properties

Luster

Vitreous, Greasy
Vitreous

Pleochroism

Weak: yellow-green green (colorless)Herve Nicolas Lazzarelli
None

Dispersion

0.020.01
0.005 1
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Transparency

Transparent
Transparent, Transparent to translucent

Refractive Index

1.64-1.691.544-1.553
1 3.25
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Optic Character

-
-

Crystal System

Orthorhombic
Trigonal

Birefringence

0.0360.009
0 0.296
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Clarity

Transparent
Transparent

Peridot and Amethyst Optic Character

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

Similar to their colors, Peridot and Amethyst 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.