Demantoid and Jet Optical Properties

Demantoid

Jet

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1 Optical Properties

1.1 Luster

Adamantine

Waxy

1.2 Pleochroism

None

AbsentWalter Schumann

1.3 Dispersion

NANone

0.007 1

1.4 Transparency

Gemmological Tables (2004)

Gemmological Tables (2004) More from other references

1.5 Refractive Index

1.880-1.8901.640-1.680

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

cubic

Amorphous

1.8 Birefringence

Not AvailableNot Available

0 0.296

1.9 Clarity

TransparentUlrich Henn and Claudio C. Milisenda

Gemmological Tables (2004) More from other references

Demantoid and Jet Optic Character

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

Similar to their colors, Demantoid and Jet 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, Demantoid is Gemmological Tables (2004) while Demantoid is Gemmological Tables (2004) in appearance.