Return to the homepage
 Return to the homepage

5 Facts about the Value of our Diamonds—the 5 Cs of Wempe

The carat weight isn’t the only decisive criterion when buying a diamond: Two diamonds of the same carat weight can differ in value depending on their clarity, color, and cut. These so-called 4 Cs are the four internationally recognized criteria for assessing the value of a diamond. In addition, a Wempe diamond has to meet a fifth important criterion: confidence. We are pleased to introduce you to these standards here.

The 5 C Play Video

1. Clarity

What is a “flawless diamond”? Almost every diamond contains natural inclusions. If no such inner flaws can be seen under tenfold magnification, the diamond is considered internally flawless. The classification of a diamond according to the internationally recognized grading table takes into account the number and size of its inclusions, as well as their type, position, and color. Only a diamond that has earned a clarity grade of SI (small inclusions) or better can satisfy our strict quality standards and become the star of our diamond jewelry, as for example in the One by Wempe Classics ring.

Finger with the One by Wempe Classics ring (1. clarity)
A brilliant solo performance: One by Wempe Classics ring with a brilliant-cut diamond of 10.01 ct in the quality G-SI 2.
Illustration Purity
Grading table for the assessment of the clarity grade— IF: internally flawless diamonds, VVS1–VVS2: very, very small inclusions, VS1–VS2: very small inclusions, SI1–SI2: small inclusions, Piqué I–III: obvious to coarse inclusions that are visible to the naked eye.

2. Color

The following rule applies: The whiter a diamond is, the rarer it is and the higher its value. It is thus the almost complete absence of color that distinguishes a high-quality diamond. Only diamonds that earn a grade H or better on the international color scale ranging from D to Z have a chance of passing our rigorous test, such as for example the diamond of the quality E-SI1 in the One by Wempe Classics ring. By the way of exception, the so-called “fancy diamonds” are rare and therefore especially valuable precisely because of their vivid hues such as pink, blue or yellow, as for example in the Opulence by Wempe Statements ring with a diamond in fancy intense yellow-VVS1.

Two fingers with one ring each (2. color)
Do you prefer rare white or strong yellow? On the left: One by Wempe Classics ring, on the right: Opulence by Wempe Statements ring.
Illustration Colour
International color scale (IDC/CIBJO)–D: exceptional white+, E: exceptional white, F: rare white+, G: rare white, H: white, I–J: slightly tinted white, K –L: tinted white, M–Z: tinted

3. Carat

The term “carat” stands for the weight, rather than the size, of a diamond. A carat equals 0.2 grams. That’s the precise weight of a carob seed, which is called a qirat in Arabic. The more weight a diamond has, the more valuable it is. Assuming that the quality is the same, a two-carat stone, however, is worth more than twice as much as a one-carat stone. That’s because the larger stone is rarer. The same applies for the brilliant-cut diamond in the One Renaissance by Wempe Classics ring: Shown below in six different carat weights—an engagement ring that will make you fall to your knees. We will be glad to provide you with detailed advice at one of our branches.

Three fingers with six rings on the middle finger (3. carat)
Growing anticipation: The One Renaissance by Wempe Classics ring with brilliant-cut diamonds in six different carat weights.
Illustration Weight
The value of a diamond of the same quality rises exponentially with an increase in the carat weight. Shown here: six diamonds between 0.25 and 2.00 carats.

4. Cut

The cut of a diamond is the sole criterion that can be influenced by a human being, and that makes it the supreme discipline among the 4Cs. A lot of experience and a sure eye are necessary for this task. Only a perfectly proportioned, symmetric cut and immaculate facets can provide the greatest amount of brilliance, while the less possible of the valuable material shall be lost. As much as 60 percent of the original material have to be sacrificed when a rough diamond is cut. The type of cut is determined by the shape of the original rough diamond. There many different types of cut, as for example in the One Halo by Wempe Classics ring with a brilliant-cut, emerald-cut, pear-shaped, or cushion-cut diamond.

Four fingers with one One Halo by Wempe Classics ring each (4. cut)
Four One Halo by Wempe Classics rings with a brilliant-cut, an emerald-cut, a pear-shaped, and a cushion-cut diamond (from left to right).
Illustration Grinding
The illustration compares a perfectly proportioned diamond to a diamond cut that is too pointed or too shallow. Little arrows symbolize the light falling upon the stone and the way it is reflected, which determines a gemstone’s brilliance.

5. Confidence

As the saying goes, trust is good, but control is better. We rely on both: We trust the expertise of the experts at our in-house gemological center and we control the origin of our diamonds. In accordance with the Kimberley Process of the United Nations, we purchase them from legitimate and ethically flawless sources. The stones come with an international certificate—so that you can have complete confidence.

You can also rely on our first-class service: solitaires are often symbols of love and therefore worn nearly every day. To be on the safe side, you can have the setting cleaned and checked once per year free of charge at one of our branches.

Five fingers with one ring each (5. confidence)
No matter whether it is a ring from the Colonna BY KIM line or a One Sunray by Wempe Classics ring, all our solitaires satisfy our rigorous standards when it comes to the 5 Cs.
Image Confidence
Every Wempe diamond with a weight of 0.25 carats or more is issued and subsequently accompanied by an individual certificate of authenticity. Every diamond with a weight of 0.50 carats or more is additionally accompanied by a detailed certificate issued by an independent diamond institute.

The 5 C of our diamonds

  1. Clarity:


    The purity is determined by the number, size, type, position, and color of the inclusions.

  2. Color:


    The less color a stone has, the more valuable it is.

  3. Carat:


    The value of a diamond increases disproportionately relative to its weight because a stone of higher carat weight is rarer.

  4. Cut:


    A perfectly proportionate cut provides greatest brilliance.

  5. Confidence:


    All our diamonds come from legitimate sources according to the Kimberley Process and are thus conflict-free.

The WEMPE-Cut®—the most spectacular way to refract light

We have patented our own cut—the WEMPE-Cut®. With 137 facets—80 facets more than the traditional brilliant cut—and a unique fire that is beyond compare.

Let us introduce you to the brilliant world of the WEMPE-Cut®.

Our engagement rings

We celebrate the beautiful tradition of getting engaged with modern solitaire rings. We have the perfect ring for every couple. Say “Yes”!

Find with us the perfect engagement ring and look forward to the most beautiful “Yes“ of your life!


By using our website, with the exception of using our data privacy statement, you agree to the use of cookies. Click here for further information about our cookies. Read more