| GIA |
AGS |
SCAN
D.N. |
CIBJO |
HRD* |
| |
|
| 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 imparing
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 |
