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Reference Values of Gems
Database updated: 15 Jan 2017
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Spinel

  • Color: red, orange, yellow, purple, blue, green, grey
  • Hardness: 8
  • Refractive index: 1.71 - 1.92
  • Density: 3.60 - 4.00
  • Chemical composition: MgAl2O4
  • Crystal structure: isometric
  • Origins: Brazil, USA, Madagascar, Sri Lanka, Burma, Thailand, Cambodia, Afghanistan, Russia.

Spinel probably is the most commonly seen sapphire imitation. The most expensive spinels are purple, red, orangey-red and blue.

 

Spinel 1.05 cts.
Spinel 1.05 cts.
Published under permission: Miguel Angel Lopez

 


Market values of Spinel  

Occurrence of Spinel  

Historical values  


 
 
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