Naturally healed fracture, with residual liquid film and negative crystal with altered inclusion in a purplish red sapphire from Sri Lanka
Micrographs

Naturally healed fracture, with residual liquid film and negative crystal with altered inclusion in a purplish red sapphire from Sri Lanka.

 
Naturally healed fracture, with residual liquid film (in the middle) and negative crystal with altered inclusion (probably diaspore) in a purplish red sapphire from Sri Lanka.
 
This corundum was heated with the traditional blow pipe technique. Blow pipe heating has been used for centuries and is still a common technique today to enhance the colour of corundum. This treatment is typically applied to intensify or lighten the colour in corundums, or sometimes to remove an undesirable secondary hue.
 
Darkfield illumination, width of the view: 1.88 mm.
 
 

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