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Dioptase is a bright emerald-green or blue-green gemstone noted for the visibility of internal cleavage planes. The transparent to translucent dioptase gemstone is uncommon and generally found in desert regions. Rivaling the beauty of emerald, dioptase is typically sold as specimens and gemstones are rarely seen, especially in sizes over 1 carat.

Dioptase Rough
Dioptase Classification
Common Name Dioptase
Species Dioptase
Dioptase Optical Properties
Transparency Transparent - Translucent
Dispersion Strength: Moderate Fire Value: 0.036
Refractive Index 1.644-1.709
Birefringence 0.051-0.053
Optic Character Uniaxial
Optic Sign Positive
Polariscope Reaction Doubly Refractive (DR)
Fluorescence SWUV: inert
LWUV: inert
Pleochroism Dichroic, unobservable or weak, varying shades of body color
Dioptase Characteristic Physical Properties
Hardness 5
Streak Greenish
Specific Gravity 3.280-3.350 Typical:3.300
Toughness Poor
Luster Vitreous
Fracture Conchoidal, Uneven
Cleavage Perfect, in one direction
Dioptase Chemistry & Crystallography
Chemical Formula CuSiO2(OH)2
Crystal System Trigonal
Chemistry Classification Silicate

Dioptase Colors

  • Green Dioptase Green

Countries of Origin

United States of America (the); Congo (the); Namibia; Brazil; Kazakhstan

Sisk Gemology Reference

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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.