Measuring a Diamond: Guide to Calculate Size

Measuring a Diamond: Guide to Calculate Size

Diamonds are known as the ‘king of all gems’ and are linked to the regal theme of elegance. Even though the diamonds are exclusive they are of various types. However, do you have any idea about how you can measure a diamond? Well, it is crucial to acquaint yourself with measuring a diamond regardless of whether it is for engagement, earrings, pendants, or any other use. Indeed, the size of a diamond defines the appearance or the overall look of the piece such as diamond earrings, the price, and, most importantly, how well it blends with the wearer.

Read More: How to Invest in Lab Diamond Jewellery?

Understanding Diamond Size


Measuring the timeless elegance

When it comes to the size of the cut diamond we have carat weight which simply means the cut in carats of the stone. In fact, it is for this reason that it is evident that carat weight does not actually represent the physical size of the diamond as one might presume when visually examining it. Luster is one of the attributes and size; the size and the shape and the making of the cut also determines how big the diamond is.

Read More: Your Guide to Diamonds

The Four Cs

These are known as the 4Cs of Diamond, namely: Carat, Cut, Color, and Clarity.


The weight of a diamond is often denoted by carat when we are talking about carat. They include; 1 carat = 200 milligrams. Carat weights give the size of the diamond and since larger carat weights are rare and expensive, they can actually add value to a diamond.


It also indicates the cut of a diamond in view of the reflection of light. In fact, a diamond with a good make will seem much more magnificent and may seem to occupy more space than a stone with the same weight.


Diamond colour is graded from D, which is white, through to Z, which indicates slight yellow or brown tint. However, colour of the diamond impacts the way it looks, unlike the size.


Clarity relates to the presence of inward or outward faults or markings also known as inclusion or blemish. Luster, on the other hand, makes diamonds shine brightly but does not change the carat weight of the stone.

Read More : Investing in Lab Grown Diamond is Good

Measuring Diamond Size: Step-by-Step

1. Carat Weight

Understand the carat weights 

The carat weight is the simplest way of measuring the size of the diamond as stated in the section above. Actually, there is a specific scale employed by jewellers to determine the weight of a diamond. What one must know is that carat weight alone is not definitive; two diamonds of similar carat weight may not be of similar size due to the cuts and the shape.

Read More: How are lab grown diamonds made

2. Dimensions


Finding the shiny finishes 

Diameter (for Round Diamonds): In round diamonds, the size refers to the diameter of the diamond figuring out across the biggest part of it. This measurement is usually stated in millimeters (mm).

3. Length and Width (for Fancy Shapes)


With fancy comes brilliance 

In the case of non-round diamond shapes including princess, emerald, or oval, both length and width are considered. These dimensions assist in measuring the size of the face-up diamond.

4. Depth


Calculating the depth of this precious stone 

Diamond depth is a measure from the table which is the flat surface on top of the stone to the culet which is the small point at the base of the stone. The depth is expressed in millimeters and defines the way the light interacts with the diamond which in turn determines the fire, brilliance, and size appearance.

5. Table Size


Learning about the ideal diamond table size 

The table is the biggest facet on the crown of the diamond. Table size is expressed in percent of the diameter of the round diamond or the average diameter of the fancy-shaped diamond. Thus, proper determination of an ideal table size contributes to the enhancement of light reflection giving beautiful modern diamond earring designs

Tools for Measuring Diamonds

  • Micrometers and Calipers: Tools required to take measurements for the diamond with a high level of precision.
  • Proportion Scope: This is a device that is employed to assess the cut and symmetry of a diamond.
  • GII Reports: Gems that are certified usually accompany a report from the Gemological Institute of India which contains information such as carat weight, dimensions as well as proportions.

Tips for Choosing the Right Size

  • Consider the Setting

Gold Frilly Flower Diamond Earrings 

The setting can enhance or detract from a diamond's perceived size. For example, a halo setting can make the center diamond appear larger.

  • Balance with Shape

                                        Gold Spring Leave Diamond Earrings 

Some shapes, like oval or marquise, can appear larger than round diamonds of the same carat weight due to their elongated forms.

  • Opt for Ideal Cut

                                     Gold Gorgeous Cluster Diamond Earrings 

Prioritize cut quality over carat weight. A well-cut diamond will sparkle more and appear larger than a poorly-cut diamond of the same weight.

Read More: What are the Pros and Cons of Lab-Grown Diamonds?

Measure your Diamond with GIVA 

However, determining the size and weight of a diamond does not simply end at the carat weight. By elaborating the notion of dimensions, depth, and table size it is easier to comprehend the role of cut and shape in defining the look of a diamond. With this information in your pocket, you will be in a good position to select a diamond with the size and brilliance of the stone that you desire for that long-lasting beautiful jewel that will be passed down for generations. Whether you need diamond earrings for women or rings, you can select the right one quickly with GIVA!
Back to blog