Diamond quality factors

All our stones are certified within the quality ranges highlighted below (eg highlighted range). They are carefully selected according to the criteria applied by the largest brands of fine jewelry.

The main diamond quality factors are called the Four Cs: Carat Weight, Color, Clarity, and Cut.

Carat weight

Diamond weights are expressed in carats (abbreviated “ct”). One carat is exactly 0.20 grams.

	5.00	3.00	2.00	1.00		0.70	0.45	0.30

← rarity increases					rarity decreases →

Color

Diamonds range from colorless to light yellow, and are graded on a D-to-Z scale.

Colorless

Near colorless

Faint

Very light

Light

← rarity increases

rarity decreases →

Clarity

Indicates the relative absence of inclusions, and is graded on a 10-step scale.

IF	VVS1	VVS2	VS1	VS2	SI1	SI2	I1	I2	I3
Internally flawless	Very very slightly included		Very slightly included		Slightly included		Included
← rarity increases					rarity decreases →

Cut

A diamond's proportions determines how it interacts with light, making it bright and scintillating. Design, appearance and craftsmanship are all factored in.

Excellent	Very good	Good	Fair	Poor
← rarity increases			rarity decreases →

Polish

Polish refers to the quality of a diamond's surface smoothness as a result of the polishing process, and is one of two grades that appraise craftsmanship. This grade is factored into the overall Cut grade.

Excellent	Very good	Good	Fair	Poor
← rarity increases			rarity decreases →

Symmetry

Symmetry reflects the relative alignment and placement of the diamond's facets. It is the second grade that appraises craftsmanship, and is also factored into the overall Cut grade.

Excellent	Very good	Good	Fair	Poor
← rarity increases			rarity decreases →

Fluorescence

Fluorescence is a visible light that a diamond emits when it is exposed to ultraviolet rays (UV).

None	Faint/Slight	Medium	Strong	Very strong
No impact on appearance		Noticeable effect on appearance
← rarity increases			rarity decreases →