Sapphire and Spinel Optical Properties

Sapphire

Spinel

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1 Optical Properties

1.1 Luster

Vitreous, Adamantine, Vitreous, Adamantine

Vitreous

1.2 Pleochroism

Strong

Absent

1.3 Dispersion

0.020.02

0.007 1

1.4 Transparency

Transparent, Translucent, Transparent to opaque

Transparent, Translucent, Transparent to translucent

1.5 Refractive Index

1.762-1.7881.73

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Trigonal

Isometric

1.8 Birefringence

0.008-0.009Not Available

0 0.296

1.9 Clarity

Transparent

TransparentUlrich Henn and Claudio C. Milisenda

Sapphire and Spinel Optic Character

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

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