Clarity
During the formation of a diamond it is possible for minute particles                of non-crystallised carbon or non-diamond crystals to be caught                within the diamond. These imperfections are called inclusions and                provide each individual diamond with unique characteristics.                            
Inclusions may not always be visible to the naked eye, however they do interfere with the passage of light through the diamond. Therefore the fewer inclusions a diamond has, the more valuable it is.
Like colour, clarity is also categorised using international grading scales. The categories of clarity are based upon the number, size and position of the inclusions within the diamond.
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