Sapphire and Andradite Garnet Optical Properties

Sapphire

Andradite Garnet

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1 Optical Properties

1.1 Luster

Vitreous, Adamantine, Vitreous, Adamantine

Adamantine

1.2 Pleochroism

Strong

Not Available

1.3 Dispersion

0.02NA

0.007 1

1.4 Transparency

Transparent, Translucent, Transparent to opaque

Transparent, Opaque, Transparent to opaque

1.5 Refractive Index

1.762-1.7881.888-1.889

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

Transparent to opaque

Sapphire and Andradite Garnet Optic Character

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

Similar to their colors, Sapphire and Andradite Garnet 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.