Quality feature
An important quality feature of diamonds is clarity (or purity). This is measured according to the type and number of inclusions that interfere with the flawlessness of the magnifier. The purer the diamond, the better it lets the light through.
| F | Flawless | |
|---|---|---|
| IF | Internally flawless | |
| VVS | Very very small inclusions | Very, very small internal features |
| VS | Very small inclusions | Very small internal features |
| SI | Small inclusions | Small internal features |
| I1 | 1st piqué | Clear inclusions |
| I2 | 2nd piqué | Large inclusions |
| I3 | 3rd piqué | Large, clearly visible inclusions |