Diamond Education
The 4 Cs of Diamonds Explained
The 4 Cs—Cut, Color, Clarity, and Carat—are the universal standards for evaluating diamond quality. Understanding these factors helps you make an informed purchase decision.
Cut
Cut refers to how well a diamond has been shaped and faceted from the rough stone. It is considered the most important of the 4 Cs because it has the greatest impact on a diamond's sparkle and visual appeal.
A well-cut diamond reflects light internally from one facet to another and then disperses it through the top of the stone, creating brilliance and fire. Cut is graded from Excellent to Poor.
Cut Grades (Best to Lowest):
Excellent → Very Good → Good → Fair → Poor
Color
Diamond color actually refers to the absence of color. A chemically pure and structurally perfect diamond has no color, like a drop of pure water. The less color in a diamond, the higher its grade and value.
The GIA color scale ranges from D (colorless) to Z (light yellow or brown). Most diamonds used in jewelry fall in the near-colorless range (G-J), which offers excellent value while appearing white to most observers.
Color Categories:
D-E-F: Colorless | G-H-I-J: Near Colorless | K-Z: Faint to Light Yellow
Clarity
Clarity measures the presence of inclusions (internal characteristics) and blemishes (external characteristics) in a diamond. Because diamonds form deep within the earth under extreme heat and pressure, most contain tiny imperfections.
Diamonds with fewer and smaller inclusions receive higher clarity grades and are more valuable. However, many inclusions are microscopic and do not affect a diamond's beauty to the naked eye.
Clarity Scale (Best to Lowest):
FL (Flawless) → IF → VVS1-VVS2 → VS1-VS2 → SI1-SI2 → I1-I2-I3
Carat
Carat is the standard unit of weight for diamonds and other gemstones. One carat equals 200 milligrams, or 0.2 grams. Larger diamonds are rarer and more valuable, so price per carat increases with diamond size.
Carat weight is often confused with size, but two diamonds of equal carat weight can appear different sizes depending on their cut proportions. A well-cut diamond may appear larger than a deep-cut diamond of the same weight.
Common Sizes:
0.50 ct | 0.75 ct | 1.00 ct | 1.50 ct | 2.00 ct and larger
FAQ
Questions About the 4 Cs
See the 4 Cs in Action
Visit SM Diamond Center in Decatur to see how the 4 Cs affect a diamond's appearance. Our experts will show you the differences and help you find the perfect balance.
Mon-Sat: 10AM - 6PM | Sun: 12PM - 6PM