Little Gems

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Sapphire

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Sapphires

 



 

Australian Sapphires
Nice blocky pieces.


Madagascan Sapphires Water worn crystals.

Montana Sapphires Smaller crystals, nice colours.

Nigerian Sapphires - Nice blocky pieces, slightly water warn.

African Rubies - Nice medium saturated colour.

 

 

Cutting Information for Sapphire and all Corundum (all colours).*

Colour: All colours including clear/colourless.
Moh’s Hardness: 9.0
Refractive Index: 1.762-1.778
Critical Angle: 37.62°
Specific Gravity: 3.95-4.03
Fracture:
Splintery/Irregular, Conchoidal
Cleavage: None 
Dispersion: Medium (.014)
Heat Sensitivity: Generally not heat sensitive.
Dichroism: Occasionally present in certain colours.
Birefringence (double refraction): Low (0.008-0.009)
Crystal Structure: Trigonal, massive

 

 

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