I1, I2 and I3 (included)
Included: inclusions are obvious and may affect the stone’s transparency, brilliance and durability.
How to read it
I1, I2 and I3 are the lowest three of the 11 grades on the GIA clarity scale. GIA’s own history of the terms notes that included replaced the older word imperfect.
Also searched as: I1, I2, I3, included diamond.
Grades describe a stone as a grading laboratory saw it. This page explains the grading scales; it doesn’t grade or value any stone.
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More diamond grading
Sources
- Diamond Clarity (GIA 4Cs), Gemological Institute of America
- Diamond Quality Factors (GIA), Gemological Institute of America, Clarity
Last reviewed September 27, 2026 by Rory Hansen. How we research