Ever saw a diamond through a diamond loupe ?

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Imperfections in diamonds is usually very difficult to spot without the diamond loupe, when a diamond is of high quality seeing the inclusions might be difficult to an untrained eye. 

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Viewing a 3 carat round diamond through a 10x diamond loupe. 

When a diamond is very well cut you will see "arrows" in the center of the diamond pointing towards the edges. This is only visible in round brilliant diamonds though.