diamond Grading
グレードの見方
diamond Grading
How to Read the Grade
The quality of a diamond is its weight(Carat)・Color(Color)・Scratch(Clarity)・Shine(Cut)The four items are the most important evaluation criteria.
01.
Carat
Carat is a unit of weight(0.1ct=0.2g)です。
Approximate diameter based on weight(Size)can be calculated.
Approximate diameter based on weight(Size)can be calculated.
02.
Color
Is it close to colorless and transparent?
23-level rating with D color as the highest
03.
Clarity
Are there few inclusions? Is the transparency high?
11-level rating with FL class as the highest
| FL | No defects inside or outside the stone |
| IF | Inside the stone, no defects |
|
VVS1 |
Even when a professional observes it with a 10x magnifying loupe Difficulty in detecting internal inclusions and the like |
|
VS1 |
Even when magnified and observed with a 10x loupe Slightly difficult to detect inclusions and the like |
|
SI1 |
Difficult to detect inclusions and other defects with the naked eye |
|
I1 |
It is easy to detect inclusions and other features with the naked eye. |
04.
Cut
Is it cut in a shape that efficiently reflects light?
Five-level rating with Excellent as the highest
The above 5-point rating may be supplemented with the following evaluations.
* Diamonds that have been verified as H&C will have an "H&C Mark" stamp on the upper right corner of the sorting bag.
* Diamonds that meet the 3EX criteria will have a "3EX" stamp placed on the upper right corner of the sorting bag.