IF
Internally FlawlessInclusions that are extremely difficult for a skilled grader to see under 10x magnification
A diamond can have many inclusions, which are able to tell us about its history, origin, or 
particularities about the stone. These inclusions may also alter its transparency.
Inclusions that are extremely difficult for a skilled grader to see under 10x magnification
Inclusions that are difficult for a skilled grader to see under 10x magnification
Inclusions that are somewhat difficult for a skilled grader to see under 10x magnification
Inclusions that are barely visible for a skilled grader to see under 10x magnification
Inclusions that are somewhat visible for a skilled grader to see under 10x magnification
Inclusions that are visible for a skilled grader to see under 10x magnification
Inclusions that are easily visible for a skilled grader to see under 10x magnification