Ruby and Coral Optical Properties

Ruby

Coral

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1 Optical Properties

1.1 Luster

Vitreous, Adamantine, Vitreous, Adamantine

Not Available

1.2 Pleochroism

Strong: purplish-red

AbsentWalter Schumann

1.3 Dispersion

0.02None

0.007 1

1.4 Transparency

Transparent, Translucent, Transparent to opaque

Translucent

1.5 Refractive Index

1.762-1.7781.486-1.658

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Trigonal

1.8 Birefringence

0.0080.160-0.172

0 0.296

1.9 Clarity

Transparent

Translucent

Ruby and Coral Optic Character

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

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