When buying a diamond, it is important to understand the quality and grading parameters of diamonds. This guide will help you to understand the 4C’s of diamonds: Carat, Cut, Clarity, and Color. It will also explain the different grading scales used to measure these qualities.


The quality of a diamond is determined by several factors, including its physical properties, its clarity, and its cut. The 4C’s (cut, color, clarity, and carat weight) are the most important factors in determining the quality of a diamond. However, other factors such as fluorescence, symmetry, and proportions can also affect a diamond’s quality.

The 4C's of Diamond

CARAT - Carat weight is how a diamond is measured and is the size of the stone. One carat is equal to 200 mg. When determining the value of a diamond, larger diamonds are usually worth more than smaller diamonds because they are rarer. However, two stones of different sizes can have the same carat weight but different values depending on the other three C’s.

COLOR - Color is judged on a scale from D (colorless) to Z (light). With this, each letter grade has a clearly defined range of color appearance. The purer the color diamond has, the higher the quality is. Diamonds with light color are less valuable than those that are colorless.

CLARITY - Clarity is defined by how many blemishes or inclusions are in a diamond. It is judged by a scale that has 6 points from included to flawless. Inclusions are internal flaws that can affect the clarity of a diamond. Blemishes are external flaws on the surface of the stone. Diamonds that are completely free of blemishes and inclusions will be rare and more valuable than those with imperfections.

CUT - Cut is how well the diamond has been cut and includes the height, depth, angles, and other factors. A well-cut stone will have facets that evenly reflect light and make the diamond sparkle. The better the cut, the more valuable the diamond will be because it takes skilled craftsmanship to create a beautiful cut.


There are a few common defects in diamonds that can affect their value and appearance. These are some of the most common ones:

CLOUDINESS - This is when the diamond appears cloudy or milky. It is caused by tiny inclusions of other materials within the diamond.

COLOR STREAKS - These are often caused by internal fractures. The streaks can be any color but are usually darker than the body color of the diamond.

CRYSTAL INCLUSIONS - These are tiny crystals of other materials that are found inside the diamond. They can affect the diamond's clarity and make it appear cloudy.

GIRDLE - The girdle is the edge of the diamond that goes around the circumference. It can be rough or polished. A rough girdle can make the diamond appear dull.

PITTING - This is when there are small indentations on the surface of the diamond. It is caused by the inclusion of other materials.

TWINNING WISPS - Twinning wisps are small white lines or tiny needles that run through the diamond. They are caused by twinning, which is when the diamond's crystals grow in two different directions.

Diamonds are a girl’s best friend. They are timeless objects that can be used to add a touch of luxury and sophistication to any outfit. In order to make sure you acquire quality pieces, it is important to understand the diamond grading parameters in detail. To check the quality of a diamond, you can use a jeweler's loupe to look for inclusions and blemishes. You can also use a diamond tester to check the diamond's hardness and thermal conductivity.

At GemsBiz, we offer natural diamonds that have been carefully graded and inspected. Browse our collection of diamonds and choose something that fits your needs.

Shop Natural Diamonds

Explore More

Comments (0)

No comments at this moment

New comment

You are replying to a comment

Product added to wishlist
Product added to compare.