The clarity scale
Clarity describes the tiny natural features inside a diamond, called inclusions, and on its surface, called blemishes. Grading laboratories judge clarity under ten times magnification.
| Grade | Meaning |
|---|---|
| FL, IF | Flawless, internally flawless: nothing visible inside at 10× |
| VVS1, VVS2 | Very, very slightly included: inclusions extremely difficult to see at 10× |
| VS1, VS2 | Very slightly included: minor inclusions, seen with effort at 10× |
| SI1, SI2 | Slightly included: inclusions noticeable at 10× |
| I1, I2, I3 | Included: inclusions obvious, and may affect brilliance |