Blue Nile Glossary
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  The clarity scale is used to describe how few inclusions a gemstone has. For diamonds, the clarity scale ranges from flawless (FL), meaning a gemstone has no internal or external flaws, to severely included (I3), meaning there are many flaws clearly visible to the unaided eye. Blue Nile only carries diamonds above SI quality.

See also: Diamond Clarity, Diamond Education, Certification, Inclusion.


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