Sapphire and Dioptase Optical Properties

Sapphire

Dioptase

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Optical Properties

Luster

Pleochroism

Dispersion

Transparency

Refractive Index

Optic Character

Crystal System

Birefringence

Clarity

Vitreous, Adamantine

Strong

0.02

Transparent, Translucent, Transparent to opaque

1.762-1.788

Trigonal

0.008-0.009

Transparent

Vitreous

Weak; dark emerald green

0.04

TranslucentHerve Nicolas Lazzarelli

1.644-1.720

Trigonal

0.051-0.053

TranslucentHerve Nicolas Lazzarelli

Sapphire and Dioptase Optic Character

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

Similar to their colors, Sapphire 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, Sapphire is Transparent, Translucent and Transparent to opaque while Sapphire is Transparent, Translucent and Transparent to opaque in appearance.