|
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 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 |
