Spinel and Dioptase Optical Properties

Spinel

Dioptase

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Optical Properties

Luster

Vitreous

Pleochroism

Absent

Weak; dark emerald green

Dispersion

0.020.04

0.005 1

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Transparency

Transparent, Translucent, Transparent to translucent

TranslucentHerve Nicolas Lazzarelli

Refractive Index

1.731.644-1.720

1 3.25

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Optic Character

Crystal System

Isometric

Trigonal

Birefringence

-99990.051-0.053

0 0.296

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Clarity

TransparentUlrich Henn and Claudio C. Milisenda

TranslucentHerve Nicolas Lazzarelli

Spinel and Dioptase Optic Character

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

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Spinel and Dioptase Transparency

Similar to their colors, Spinel 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, Spinel is Transparent, Translucent and Transparent to translucent while Spinel is Transparent, Translucent and Transparent to translucent in appearance.