Understanding the 4Cs
The 4Cs—Cut, Color, Clarity, and Carat—are the universal standards for evaluating diamond quality. Understanding them helps you choose the perfect diamond.
The 4Cs were developed by the Gemological Institute of America (GIA) to create a universal language for diamond quality. While all four factors are important, their relative importance depends on your priorities and budget. At 6ix of Diamonds, all our diamonds are certified and graded by reputable gemological laboratories.
Cut
The most important factor in a diamond's beauty. Cut determines how well a diamond reflects light.
| Grade | Description |
|---|---|
Ideal/ExcellentRecommended | Maximum fire and brilliance. Light reflects from one facet to another and disperses through the top. |
Very GoodRecommended | Properly reflects most light. Appears similar to Excellent under normal viewing. |
Good | Reflects most light. An excellent value for those on a budget. |
Fair | Still a quality diamond, but not as brilliant. Light escapes from sides/bottom. |
Poor | Most light escapes from sides and bottom. Not recommended. |
6ix of Diamonds Tip
We recommend Excellent or Very Good cut for maximum sparkle. This is where you should prioritize your budget.
Color
Diamond color refers to the absence of color. The less color, the higher the grade.
| Grade | Description |
|---|---|
D-F (Colorless)Recommended | Extremely rare and valuable. No visible color even under magnification. |
G-J (Near Colorless)Recommended | Excellent value. Color difficult to detect unless compared to higher grades. |
K-M (Faint) | Slight yellow tint visible. Can look beautiful in yellow gold settings. |
N-R (Very Light) | Noticeable yellow or brown tint. |
S-Z (Light) | Obvious color. Not typically used in fine jewelry. |
6ix of Diamonds Tip
For white gold or platinum settings, we recommend G-I color. For yellow gold, you can go as low as K and the warmth will complement the metal.
Clarity
Clarity measures the presence of natural imperfections called inclusions. Most are invisible to the naked eye.
| Grade | Description |
|---|---|
FL/IF (Flawless) | No inclusions visible under 10x magnification. Extremely rare and expensive. |
VVS1/VVS2 (Very Very Slight) | Inclusions difficult to see even under 10x magnification. Excellent quality. |
VS1/VS2 (Very Slight)Recommended | Minor inclusions visible under 10x. Not visible to the naked eye. |
SI1/SI2 (Slight)Recommended | Inclusions visible under 10x. May or may not be visible to naked eye. |
I1/I2/I3 (Included) | Inclusions visible to the naked eye. May affect brilliance. |
6ix of Diamonds Tip
VS2 and SI1 offer the best value. Focus on "eye-clean" diamonds where inclusions are not visible without magnification.
Carat
Carat is the unit of weight for diamonds. One carat equals 0.2 grams.
| Grade | Description |
|---|---|
0.25 - 0.50ct | Delicate and elegant. Perfect for everyday pieces and stackable rings. |
0.50 - 0.99ct | Classic size range. Excellent balance of size and value. |
1.00 - 1.49ctRecommended | Popular choice for engagement rings. Noticeable and impressive. |
1.50 - 2.00ct | Significant presence. Makes a strong statement. |
2.00ct+ | Exceptional and rare. Investment-quality stones. |
6ix of Diamonds Tip
Buying just under popular weights (0.90ct instead of 1.00ct) can save significantly while appearing nearly identical in size.
Diamond Shapes
Beyond the 4Cs, the shape of your diamond is a matter of personal style. Each shape has its own character and appeal.
Round Brilliant
The most popular and brilliant cut. 58 facets maximize sparkle.
Princess
Square shape with brilliant sparkle. Modern and elegant.
Cushion
Rounded corners with large facets. Romantic vintage appeal.
Oval
Elongated shape that flatters the finger. Excellent brilliance.
Emerald
Step-cut with rectangular facets. Sophisticated and unique.
Pear
Teardrop shape combining round and marquise. Distinctive elegance.
Marquise
Football-shaped with pointed ends. Maximizes carat weight appearance.
Radiant
Square or rectangular with trimmed corners. Combines elegance with brilliance.
Always Certified
Every diamond at 6ix of Diamonds comes with certification from a reputable gemological laboratory. We work with GIA, AGS, and IGI certified diamonds to ensure you know exactly what you're purchasing.
GIA
Gemological Institute of America
AGS
American Gem Society
IGI
International Gemological Institute
Ready to Find Your Diamond?
Now that you understand the 4Cs, explore our collection or build your own custom piece.