Understanding Diamond Clarity: The 4Cs of Diamonds

What is Diamond Clarity?




If you want to know more about inclusions, we go a bit further into detail in our Diamond Inclusions section.

Diamond Grading


Diamond graders plot the inclusions they see in the diamond on a diagram which is included on diamond grading reports. See how AGS Lab diamond graders plot diamonds.


The Clarity Scale

The clarity scale originated because jewelers were using terms that were unstandardized and could be easily misinterpreted. Descriptive terms such as “eye clean,” or “included” were vague and didn’t communicate the clarity of the diamond effectively.

The modern clarity scale was invented in the 1950s, by a former president of GIA, Richard T. Liddicoat, Jr. With minor modifications, it has been the universal standard ever since, using verbal descriptors most are now familiar with: Flawless, Internally Flawless, VVS1, VVS2, VS1, VS2, SI1, SI2, I1, I2, and I3.

AGS Diamond Clarity Scale

Clarity is considered important in the value of a diamond because of the notion that diamonds with a higher clarity are rarer in nature. 

The Bottom Line

It’s important to have your diamonds graded by a credentialed expert or a reputable diamond grading laboratory. Look for AGS jewelers to find reputable AGS member stores.