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.
| D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
| 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 → | |||
