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.

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
VVS2

 Even when a professional observes it with a 10x magnifying loupe
Difficulty in detecting internal inclusions and the like

VS1
VS2

 Even when magnified and observed with a 10x loupe
Slightly difficult to detect inclusions and the like

SI1
SI2

 Difficult to detect inclusions and other defects with the naked eye

I1
I2
I3

 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.