08/28/2026
Thomas Michaels Designers on the 4C’s of Diamonds
The First C: Clarity
Every natural diamond carries a story of how it was formed deep within the earth. Part of that story shows up in its clarity.
Clarity refers to the presence of internal characteristics, called inclusions, and external characteristics, known as blemishes. These may appear as tiny crystals, feathers, lines, or other markings created during a diamond’s natural formation. Like a fingerprint, their unique placement can help identify an individual diamond.
Most inclusions are microscopic and invisible to the naked eye. Unless they interfere with the way light travels through the stone, they may have little effect on its visible beauty. Generally, however, the fewer and less noticeable the inclusions, the rarer, and therefore more valuable, the diamond.
Diamond clarity is evaluated under 10× magnification and graded on a scale:
FL / IF: Flawless & Internally Flawless
Exceptionally rare. No inclusions are visible to a trained grader under 10× magnification.
VVS1 / VVS2: Very, Very Slightly Included
Minute inclusions that are extremely difficult to locate, even under magnification.
VS1 / VS2: Very Slightly Included
Minor inclusions visible under magnification, but generally not noticeable to the unaided eye.
SI1 / SI2: Slightly Included
Inclusions are more readily visible under magnification and, depending on the individual diamond, may sometimes be visible without it.
I1 / I2 / I3: Included
Inclusions are obvious under magnification and may be visible to the naked eye.
But clarity is only part of what makes a diamond beautiful.
A higher clarity grade doesn’t automatically mean a diamond will look more beautiful to the person wearing it. The location, size, and nature of the inclusions, as well as the diamond’s cut, color, and overall character, all matter.
Understanding those subtleties is where an experienced jeweler’s guidance becomes invaluable.