Sillimanite and Fancy Diamond Optical Properties

Sillimanite

Fancy Diamond

Add ⊕

1 Optical Properties

1.1 Luster

Vitreous, Subadamantine, Silky

Not Available

1.2 Pleochroism

Colourless to pale brown to yellow

Not Available

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Transparent, Translucent

Not Available

1.5 Refractive Index

1.653-1.6852.42

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Orthorhombic

cubic

1.8 Birefringence

0.020-0.022Not Available

0 0.296

1.9 Clarity

Transparent

Color grading system

Sillimanite and Fancy Diamond Optic Character

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

Compare Blue Gemstones

Sillimanite Vs Starlite

Sillimanite Vs Tanzanite

Sillimanite Vs Strontium Titanate

Sillimanite and Fancy Diamond Transparency

Similar to their colors, Sillimanite and Fancy Diamond 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, Sillimanite is Translucent and Transparent while Sillimanite is Translucent and Transparent in appearance.