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Reference Values of Gems
Database updated: 15 Jan 2017
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Zultanite (Color Change Diaspore)

  • Color: color change from light greyish green to light brownish
  • Hardness: 6.5 - 7
  • Refractive index: 1.68 - 1.75
  • Density: 3.30 - 3.40
  • Chemical composition: a-AlO(OH)
  • Crystal structure: Orthorhombic
  • Origins: Turkey.

Considered to be a collector's stone, Turkish diaspore gems with a color change effect are sold under the commercial names of Zultanite or Csarite. Specimens over 10 ct are rare.


 

 


Market values of Zultanite (Color Change Diaspore)  

Occurrence of Zultanite (Color Change Diaspore)  

Historical values  


 
 
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