[ Go back to previous page ]
*Caution: You don't close this window. Please click a link above to return to previous screen.
|
|
Synopsis on the appraisal standard for Diamond [ Japanese ]
| 1. CARAT WEIGHT |
|
The weight for Diamond is expressed as Carat below, and usually measured to 1/1000, it is indicated to the third digit under point.
1ct = 0.200g
|
| 2. COLOR |
|
Expresses the classification of grade for the color of Diamond as follows
on the table. It'll become a high grade according to the colorless. The
price will be changed to 6-8% up one grade.
| D |
E |
F |
G |
H |
I |
J |
K |
L |
M |
N |
O |
P |
Q |
R |
ST...Z |
| Colorless |
Almost Colorless |
A Little Yellow |
Very Light Yellow
|
Yellow |
In case of more than this, it'll become "fancy color".
|
| 3. CLARITY |
|
Expresses whether it has the flaw and inclusions or not. Classifies grade
from top such as the COLOR as follows on the table. cation of grade for
the color of Diamond as follows on the table. The price will be changed
to about 10-20% per one grade.
| FL |
IF |
VVS1 |
VVS2 |
VS1 |
VS2 |
SI1 |
SI2 |
I1 |
I2 |
I3 |
| None Flaw |
Slight Flaw |
A Just Little Flaw |
Sees easy by a loupe with 10 times |
Flaw which can be seen with a naked eye |
|
| 4. CUT & PROPORTION |
|
The evaluation of the cut is decided by the group of Japanese discrimination
dealer without GIA standard. The table below is based on AGL standard (Association
of Gemological Laboratories Japan). Cut influences the brightness of Diamond
so much. The price will be changed to about 8% per one grade.
| EXCELENT |
VERY GOOD |
GOOD |
FAIR |
POOR |
| Near Perfect |
Very Good |
Good |
Acceptable |
NG |
|
|
