Internal Grain Center (IntGr) inclusions (aka internal graining) are caused by irregular diamond crystal growth which creates internal distortions, waviness, and haze within a cut diamond.
Internal Trigons Grain Center Inclusions ...
Grain Center
A small area of intense crystal structure distortion which usually associated with pinpoints.
Graining ...
grain center
Although not visible from every angle, grain center looks like a transparent tornado inside the diamond..
feather
Any break in a diamond.
 See also: Grain, Growth, Internal graining, Diamond, Crystal
  
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