SI2 (Slightly Included 2)
Inclusions readily visible under 10x; about 30-40% of SI2 diamonds remain eye-clean with careful selection.
SI2 (Slightly Included 2): Inclusions readily visible under 10x; about 30-40% of SI2 diamonds remain eye-clean with careful selection.
SI2 requires the most selection discipline of the commonly-traded grades. Many SI2 stones have inclusions visible without magnification, but some, particularly in small brilliant cuts with peripheral inclusions, remain eye-clean. The financial incentive is significant (SI2 can be half the price of VS1 at the same spec) but the buyer must either trust a retailer's eye-clean guarantee or inspect the stone personally.
Standards bodies: GIA
Frequently asked questions
Can an SI2 diamond be eye-clean?
Sometimes. Roughly one in three SI2 stones in round brilliant cuts under 1.5ct meet the eye-clean bar with careful selection.
Is SI2 a good budget choice?
Only if you can verify the specific stone is eye-clean. Without verification, upgrading to SI1 or VS2 is safer.
Do retailers honour eye-clean guarantees on SI2?
Major retailers do (with return policies). Smaller sellers may not. Always confirm the policy in writing.
What shapes work best with SI2?
Round brilliant with well-placed inclusions. Avoid step cuts and large centre stones.
How does SI2 compare in lab-grown?
Lab-grown SI2 is less common because controlled growth reduces inclusion rates. When available, the price advantage over higher grades is smaller in lab-grown than in natural.
Related terms
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