saf-ahyuh r

Diaspore is beautiful and exotic in a soft, subtle manner. It is also one of the lesser known of the color-change gemstones. Some of the finest examples of gem quality diaspore are found in Turkey's Anatolian Mountains, but it can be found in numerous places around the globe. A rising star in fine jewelry, it's easy to fall in love with its sparklingly brilliant, tranquil earthy colors.

Diaspore Polished
Diaspore Classification
Common Name Diaspore
Species Diaspore
Diaspore Optical Properties
Transparency Transparent
Dispersion Strength: Weak Fire
Refractive Index 1.702-1.750
Birefringence 0.048
Optic Character Biaxial
Optic Sign Positive
Polariscope Reaction Doubly Refractive (DR)
Pleochroism Dichroic, strong reddish violet to reddish brown or green to grayish green
Diaspore Characteristic Physical Properties
Hardness 6.5-7
Streak White
Specific Gravity 3.300-3.390 Range:0.12/-0.18 Typical:3.380
Luster Vitreous
Fracture Conchoidal
Cleavage Perfect, in one direction, Good, in one direction
Diaspore Chemistry & Crystallography
Chemical Name aluminum oxide hydroxide
Chemical Formula AlO(OH)
Crystal System Orthorhombic
Chemistry Classification Oxide

Diaspore Colors

  • Pink Diaspore Pink
  • Yellow Diaspore Yellow
  • Green Diaspore Green
  • White Diaspore White
  • Gray Diaspore Gray
  • Colorless Diaspore Colorless
  • Brown Diaspore Brown

Alternate Names

Zultanite(R), Csarite

Countries of Origin

Myanmar; Turkey; Unknown; India

Sisk Gemology Reference

Showcasing 200 gemstones in over 1,000 pages and accompanied by more than 2,000 photos, The Sisk Gemology Reference is a must-have in every collector’s library. Each comprehensive, three-volume set features state-of-the-art photography, detailed illustrations, and scientifically precise descriptions to create an entrancing experience for gemstone amateurs and afficionados alike.

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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.