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Violane is a manganese-rich, coarse variety of diopside cabbed for ornamental use or carved for decorative purposes. Colors range from light blue to deep violet. The main source is Saint-Marcel, in the Aosta Valley, Italy. Other localities include Greece and the United States (California).

Violane Classification
Common Name Violane
Species Diopside
Violane Optical Properties
Transparency Opaque-Translucent
Dispersion Strength: Weak Fire
Refractive Index 1.664-1.724
Optic Character Biaxial
Optic Sign Positive
Polariscope Reaction Aggregate (AGG)
Pleochroism Unobservable
Violane Characteristic Physical Properties
Hardness 5-6
Streak White
Specific Gravity 3.220-3.380
Luster Vitreous, Resinous
Stability Brittle
Fracture Uneven to Concoidial, Brittle
Cleavage Indistinct, Good
Violane Chemistry & Crystallography
Chemical Name Calcium Magnesium Manganese Silicate
Chemical Formula CaMgMnSi2O6
Crystal System Monoclinic
Chemistry Classification Silicate

Violane Colors

  • Blue Violane Blue
  • Purple Violane Purple

Countries of Origin

Greece; United States of America (the); Italy; Germany

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Tim Matthews


Tim Matthews

Tim Matthews is President and Chief Executive Officer of Jewelry Television® (JTV), as well as a member of the company's Board of Directors. He oversees and leads all aspects of the company's powerful omni-digital retail platform that uniquely specializes in fine jewelry and gemstones. His passion for business and gemstones has led him to become a recognized expert in the field of gemology. He is a life member of the Gemmological Association of Great Britain (Gem-A) and has earned Gem-A's highest degrees, the Gemmology (FGA) and Diamond (DGA) diplomas. He is also a Graduate Gemologist (GG) of the Gemological Institute of America (GIA) and has also completed GIA's Graduate Diplomas in Diamonds, Colored Stones and Pearls. Under his leadership, JTV has become the leader in the sourcing and selling of color gemstones and jewelry.

This page was created on June 27, 2014.

This page was last edited on October 24, 2019.