understanding diamond grading

In today’s guide to understanding diamond grading, we will be going over some important pointers so that you can pick the perfect stone for your engagement ring in Winnipeg. Diamond grading is a process in which trusted experts use a standardized grading system to quantify key qualities of a diamond. This helps diamond shoppers understand how a specific diamond will look, making it easier to purchase the right gemstone without worry.Independent certification is how you can be sure that you’re getting a quality diamond that’s accurately graded without bias.

In the following sections, we will explore the key aspects of diamond grading, focusing on the 4Cs—cut, color, clarity, and carat weight—and other important factors that influence a diamond’s overall quality.


First in our guide to understanding diamond grading is cut. The cut of a diamond refers to its proportions, symmetry, and polish. It plays a crucial role in the diamond’s brilliance, fire, and scintillation. The cut is often considered the most important of the 4Cs, as it directly affects the diamond’s ability to reflect light out toward the eye. The Gemological Institute of America (GIA) grades diamond cut on a scale from Excellent to Poor. When choosing a diamond, opt for an Excellent cut grade to ensure maximum sparkle and brilliance. For this reason, we take time to review the exact proportions of each diamond to ensure that the diamond will be as bright as possible. 


Diamond color is graded on a scale ranging from D (colorless) to Z (light yellow or brown). The less color a diamond exhibits, the higher its value. Colorless diamonds allow more light to pass through, creating greater brilliance. However, slight color variations may not be noticeable to the naked eye, especially in diamonds with higher cut grades. When selecting a diamond, aim for a color grade between D and H for optimal beauty and value.


Clarity is another important factor when it comes to understanding diamond grading. This refers to the presence of internal or external blemishes, known as inclusions. Clarity is graded on a scale ranging from Flawless (no inclusions or blemishes visible under 10x magnification) to Included (inclusions visible to the naked eye). The GIA grades diamond clarity using six categories: Flawless, Internally Flawless, VVS (Very, Very Slightly Included), VS (Very Slightly Included), SI (Slightly Included), and I (Included). For the best value, consider diamonds in the VS1 to VS2 range, as they typically have no visible inclusions to the naked eye.

To learn more about clarity please check out our article “what are VVS diamonds?”

Carat Weight:

Next on our guide to understanding diamond grading is carat weight.The carat weight measures a diamond’s size. One carat is equivalent to 200 milligrams. While carat weight influences a diamond’s value, it is important to note that size alone does not determine a diamond’s quality. A smaller diamond with excellent cut, color, and clarity may appear more beautiful than a larger diamond with lower grades. Consider your personal preferences and budget when deciding on the carat weight of your diamond.

Beyond the 4Cs:

While the 4Cs are essential in understanding diamond grading, there are additional factors to consider when evaluating a diamond’s quality. These include fluorescence (the diamond’s reaction to ultraviolet light), certification (reputable diamond grading reports from organizations like GIA or AGS), and shape (round, princess, oval, etc.). When it comes to diamond shape be sure to take into account the style preferences of the person who will be wearing it.

For more information on diamond shape, check out our article “how does diamond shape affect its price?”

To learn more, be sure to check out our diamond education page as well as the excellent learning resources at the GIA and AGS websites. 

Consider Your Budget:

Diamonds vary significantly in price, and it’s important to establish a budget before beginning your search. Determine what aspects of the diamond are most important to you—whether it’s size, color, or clarity—and allocate your budget accordingly. Remember that finding a balance between the 4Cs and your budget is key to selecting a diamond that meets your desired criteria.


We hope you enjoyed this guide to understanding diamond grading. This knowledge can be of value when purchasing a diamond, as it allows you to assess a diamond’s quality and make an informed decision. The 4Cs—cut, color, clarity, and carat weight—serve as a foundation for diamond grading, but other factors such as fluorescence, certification, and shape also influence a diamond’s appeal. By considering these aspects and aligning them with your preferences and budget, you can confidently choose a diamond that meets your expectations and will look beautiful in your engagement ring or custom jewelry piece. Remember, a well-graded diamond is a treasure that will be cherished for a lifetime.