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Dumortierite and Pearl Optical Properties


Pearl and Dumortierite Optical Properties


Optical Properties

Luster
Vitreous   
Pearly   

Pleochroism
Strong; X = deep blue or violet; Y = yellow to red-violet or nearly colorless; Z = colorless or very pale blue   
AbsentWalter Schumann   

Dispersion
None   
None   

Transparency
Translucent, Translucent to opaque   
Translucent, Opaque   

Refractive Index
1.669-1.723   
1.52-1.66   

Optic Character
Not Available   
Not Available   

Crystal System
Orthorhombic   
Orthorhombic   

Birefringence
0.011-0.037   
0.156   

Clarity
Translucent   
Translucent   

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Dumortierite and Pearl Optic Character

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

Similar to their colors, Dumortierite and Pearl 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, Dumortierite is Translucent and Translucent to opaque while Dumortierite is Translucent and Translucent to opaque in appearance.

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