I1 clarity

I1 means included: marks are obvious and can dull the sparkle.

Grade: 9th of 11, between SI2 and I2
In nature: Marks can affect sparkle and strength.
In RXXO: 1 in 7 diamonds

I1 in RXXO

464diamonds like this in RXXO right now

Questions

What does I1 mean on a diamond?

Included. Marks are obvious and can dull the sparkle.

How rare is an I1 diamond in RXXO?

About 1 in 7. The most common grade is I3, about 1 in 5.

Is I1 better than I2?

Yes, by one grade. I1 sits just above I2 on the 11-step clarity scale. In RXXO, an I1 is about 1 in 7, an I2 about 1 in 6.

RXXO numbers are the odds every mint draws from. Updated 8 October 2026.