Diamond Guide

Understanding the different characteristics that make each diamond unique is instrumental to finding the diamond of your dreams.

Whether you are searching for the perfect diamond for your engagement ring or choosing the perfect setting for an heirloom diamond, it’s important to understand the different characteristics that make each diamond unique. Let’s dive into popular diamond topics, such as the 4Cs of diamonds, so you can feel confident having a conversation with your jeweler about the essential qualities that determine a diamond’s value.

The 4Cs of Diamonds

You may have heard of the 4Cs of diamond quality, a globally accepted standard for describing diamonds created by the Gemological Institute of America®.  These qualities — cut, color, clarity, and carat weight — contribute to the overall value and beauty of a diamond. Combine the 4Cs of diamond quality with your own visual preferences to find the diamond of your dreams.

Diamond Cut

Understanding Diamond Cut

A diamond’s cut — its symmetry, proportions, and faceting — determines how much light reflects out from the stone. In other words, cut creates brilliance, fire, and scintillation. Each of these dimensions combine to determine its beauty and price as cut has the greatest influence over a diamond’s ability to sparkle. Meet with your preferred jeweler to understand how a diamond’s cut impacts the sparkle of your favorite diamond.

There are three terms to know in reference to diamond cuts: shallow, ideal, and deep.

4Cs of diamonds shallow cut

Shallow Cut

Shallow-cut diamonds allow light to escape out of the bottom of the stone which sacrifices brilliance.

4Cs of diamonds ideal cut

Ideal Cut

Ideal-cut diamonds have optimal proportions and angles which reflects almost all light and maximizes brilliance.

4cs of diamonds deep cut

Deep Cut

Deep-cut diamonds reflect light improperly as the total depth and diameter aren’t proportional.

Diamond Color

Or Lack thereof

Diamond color measures the absence of color in a particular diamond using the GIA® D-to-Z grading system*, where D refers to colorless and Z refers to yellow. The most popular preferences are colorless (D E F) or near colorless (G H I J). The most common color grade falls between F-H. Understanding what diamond color means helps in choosing the right diamond. A chemically pure and structurally perfect diamond has no hue, like a drop of pure water, and consequently, this translates to a higher value. 

D E F

Colorless

G H I J

Near Colorless

K L M

Faint Yellow

N O P Q R

Very Light Yellow

S T U V W X Y

Light Yellow

Z

Yellow

These diamond color distinctions are very subtle. They are invisible to the untrained eye. However, these distinctions make a difference in diamond quality and price. Hence, it is important to get a qualified expert’s opinion in evaluating the best color for your diamond.

*Fancy-colored diamonds are graded using a different grading system.

Diamond Clarity

the Absence of Inclusions and Blemishes

To understand diamond clarity, we must first understand how diamonds are created. Natural diamonds are the result of carbon exposed to tremendous heat and pressure deep in the earth for millions, sometimes billions of years. This process can result in a variety of internal characteristics called inclusions. External characteristics are called blemishes.

A diamond’s clarity measures the absence of inclusions and blemishes. Inclusions and blemishes are then graded on a scale of flawless (FL) to included (I1, I2, I3). Most inclusions are not visible to the untrained eye but impact the strength of a diamond.

Diamond Carat Weight

The Proportion and Depth of a Diamond

The carat of a diamond refers to its metric carat weight. One carat is equal to 0.2 grams. Carat is not to be confused with karat, which measures metal purity. Larger diamonds are more rare. The price increases exponentially the higher the carat weight. Diamonds of equal weight are not necessarily the same millimeter size. Different proportions and depths will result in different size and weight combinations.

See the interactive millimeter to carat size refernce in the images shown below. These are meant to show proportions and may not reflect actual carat size. 

round

Round

oval

Oval

cushion

Cushion

emerald

Emerald

marquise

Marquise

princess

Princess

asscher

Asscher

pear

Pear

heart

Heart

4.1 mm

0

0.25 CT

5.1 mm

1

0.5 CT

5.8 mm

2

0.75 CT

6.4 mm

3

1 CT

6.9 mm

4

1.25 CT

7.4 mm

5

1.5 CT

8 mm

6

2 CT

9.3 mm

7

3 CT

While the 4Cs are the most important factors when choosing a diamond, we know selecting a diamond for engagement rings can be very intricate, so we’ve included additional information to make sure you are aware of all of your options to consider.  See below to explore more about diamond shapes, diamond classification (natural vs lab-grown diamonds), and a diamond glossary.

Diamond Shapes

Explore round and fancy shapes that diamonds can take to steal the show on your ring.

Learn More

Lab-Grown Diamonds

Find out all about lab-grown beauties and why they are growing in popularity among diamond lovers.

Learn More

Diamond Glossary

Diamond terminology can be heavy, but we break down common definitions to help. 

Learn More