| GIA | AGS | SCAN D.N. | CIBJO | HRD* | |
| Main Grades* | Subgrades* | ||||
| FL (flawless) | 0 | Loupe clean | FL | Loupe
clean (lc). Free from inclusions and bearding |
Loupe
clean. Inclusions do not exceed 5 micron* |
|
Internally
flawless
|
1 | IF | |||
| VVS1 (very, very slightly included) |
VVS | VVS1 | VVS* (VVS1, VVS2) Very, very small inclusion(s), very hard to find with a 10x loupe |
VVS1 - VVS2: Inclusions visible through table have average sizes of 12 micron (VVS1), 25 micron (VVS2); larger when visible through other facets | |
| VVS2 (very, very slightly included) |
2 | VVS2 | |||
| VS1 (very slightly included) |
3 | VS | VVS1 | VS*
(VS1, VS2) Very small inclusion(s), which can hardly be found with a 10x loupe |
VS1 - VS2: Inclusions visible through table have average sizes of 40 micron (VS1), 70 micron (VS2); larger when visible through other facets |
| VS2 (very slightly included) |
4 | VVS2 | |||
| SI1 (slightly included) |
5 | SI | SI1 | SI
(SI1, SI2) Small inclusion(s), easy to find with a 10x loupe, not seen with the naked eye through the crown side |
S1. Inclusions visible through table have average sizes of 150 micron |
| SI2 (slightly included) |
6 | SI2 | |||
| I1 (imperfect) |
7 | P | P1 | PI
(Pique I) Inclusion(s) immediately evident with a 10x loupe, difficult to find with the naked eye through the crown side, not impairing brilliance |
P1. Inclusions which are visible through the crown-side have average sizes of 0.5 mm |
| 8 | |||||
| I2 (imperfect) |
P2 | PII
(Pique II) Large and/or numerous inclusion(s), easily visible to the naked eye through the crown side and which slightly reduce(s) brilliance |
P2. Inclusions have average sizes of 1.5 mm; they slightly reduce brilliancy | ||
| 9 | |||||
| I3 (imperfect) |
10 | P3 | PII
(Pique II) Large and/or numerous inclusion(s), very easily visible to the naked eye through the crown side and which reduce(s) brilliance |
P3. Inclusions have average sizes of 3 mm or larger; they reduce the brilliancy | |
| * For stones under 0.47ct | * For stones 0.47ct and larger | *Subdivision of VVS and VS into two further subdivisions done only for sizes 0.47ct and larger | *In conformity with IOC rules, although latter have not published micron dimensions for grades below Loupe clean. The mentioned size, are for bright inclusions, sizes increase for less bright | ||