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Pearl
Pearl

Tortoiseshell
Tortoiseshell



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Tortoiseshell

Pearl and Tortoiseshell Optical Properties

1 Optical Properties
1.1 Luster
Pearly
Not Available
1.2 Pleochroism
AbsentWalter Schumann
Not Available
1.3 Dispersion
NoneNA
Fluorite Optical Properties
0.007 1
1.4 Transparency
Translucent, Opaque
Gemmological Tables (2004)
1.5 Refractive Index
1.52-1.661.540-1.560
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
Orthorhombic
Not Available
1.8 Birefringence
0.156Not Available
Achroite
0 0.296
1.9 Clarity
Translucent
OpaqueUlrich Henn and Claudio C. Milisenda

Pearl and Tortoiseshell Optic Character

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

Pearl and Tortoiseshell Transparency

Similar to their colors, Pearl and Tortoiseshell 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, Pearl is Opaque and Translucent while Pearl is Opaque and Translucent in appearance.