SI1 and SI2 (slightly included)
Slightly included: inclusions are noticeable under 10x magnification.
How to read it
SI1 and SI2 sit below VS on the GIA clarity scale and above the included grades. GIA says most diamonds seen in jewelry stores fall between VS and SI.
Also searched as: SI, SI1, SI2, SI clarity.
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