4 C's : cut, color, carat, and clarity   

Flawless (FL)

Refers to diamonds which under the inspection of a skilled observer using a 10x microscope cannot see any internal or external imperfections.

Internally Flawless (IF)

An internally flawless diamond has no visible internal imperfections, but may have minor surface blemishes.

Both FL and IF are very rare and beautiful diamonds.

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