Demantoid and Watermelon Tourmaline Optical Properties

Demantoid

Watermelon Tourmaline

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1 Optical Properties

1.1 Luster

Adamantine

Vitreous

1.2 Pleochroism

None

Not Available

1.3 Dispersion

NA0.02

0.007 1

1.4 Transparency

Gemmological Tables (2004)

TransparentGemdat.org, Management Team (2012)

1.5 Refractive Index

1.880-1.8901.614-1.666

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

cubic

Not Available

1.8 Birefringence

Not Available0.014-0.040

0 0.296

1.9 Clarity

TransparentUlrich Henn and Claudio C. Milisenda

TransparentGemdat.org

Demantoid and Watermelon Tourmaline Optic Character

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

Similar to their colors, Demantoid and Watermelon Tourmaline 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.