About Quality Evaluation

Color, Clarity, Brilliance,
The three elements that determine the beauty of a gemstone
We will evaluate and indicate based on the following criteria.

カラー │ COLOR

Among the applicable gemstones, the color tones considered beautiful (Color tone, intensity, vividness)Whether or not?
Are diamonds colorless and transparent?

Diamond Evaluation Criteria

Clarity │ QLARITY

Are there any inclusions, scratches, or chips, and what are their sizes?

Diamond Evaluation Criteria

Brilliance │ CUT

What is the inherent brilliance and transparency of that gemstone?
Is the stone reflecting the light it has captured inside at the ideal angle?

Diamond Evaluation Criteria

Evaluation Method

1. At the loupe level, do you notice any defects?

We will observe and evaluate using a 10x magnifying glass.

2. Observe with the naked eye: Are any defects noticeable?

We bring the product close to the eye and observe and evaluate it with the naked eye.

3. Do you notice any flaws when wearing it?

The product is observed and evaluated with the naked eye from a distance of 50 cm.

Evaluation Criteria

SS	Even at the loupe level, it is difficult to confirm defects, Or "Highest Rank" that cannot be verified
S	A "high rank" that doesn't show flaws even at the loupe level
A	"Medium to high rank" where it is difficult to confirm defects with the naked eye
B	"Medium rank" where defects are not noticeable to the naked eye
C	"Mid to low rank" that doesn't bother you when worn
D	"Low rank" where defects can be clearly seen when worn

Overall Rating

Comprehensive quality evaluation based on the assessment results of three items (Color, Clarity, Cut).

Overall Rating	Evaluation of 3 items
SS	All three items are S rank or higher Including SS rank evaluation
S	All three items are ranked A or higher Including evaluations of S rank or higher
A	All three items are B rank or higher Including evaluations of rank A or higher
B	All three items are ranked C or higher Including evaluations of B class or higher
C	Items that include two or more evaluations of rank C or higher.
D	Items with fewer than two evaluations of rank C or higher.