Clarity measures internal "inclusions" and surface "blemishes" under 10x magnification. Description Buyer Advice Flawless / Internally Flawless Rare, "museum quality," and very expensive. VVS1 / VVS2 Very, Very Slightly Included

Noticeable under magnification; SI1 is usually eye-clean, SI2 may show marks. Obvious inclusions that can affect sparkle or durability. 🎯 Value "Sweet Spots"

Minute inclusions; difficult for pros to find even with magnification. Very Slightly Included Minor inclusions; invisible to the naked eye . SI1 / SI2 Slightly Included