4 carat diamond ring

How Big is a Four Carat Diamond?

If you are in the market for a four-carat diamond ring. In that case, you will find that the recommendations for selecting a diamond of this size are slightly different from the guidelines for choosing a diamond of any other size. If you want a high-quality 4-carat diamond ring, you should look for a piece of jewelry with the appropriate combination of clarity, cut, color, and form for the carat weight. Depending on the form and cut of a diamond, it might appear larger or smaller than it is, regardless of its carat weight. However, for individuals who prefer to make a statement, size is still an essential factor to consider.

Four carat diamond

A 4-carat diamond ring is an ideal gift for a special someone in your life. No other stone has the unique ability to make someone feel special and bring out their best features as this one does. Its dazzling brilliance and flaming surface reflect light in a way that no other stone can. It would help if you made sure that these rules are followed when purchasing to ensure that they receive an eye-catching yet gorgeous piece of jewelry without breaking the wallet.

What is a 4-Carat Diamond?

Four-carat diamonds are a rare and valuable gemstone, and they are worth thousands of dollars. When we talk about 4-carat diamonds, we’re talking about the weight of the diamond, not the size of the diamond. 0.8 grams (or 800 milligrams) of a 4-carat diamond equals 0.8 grams of a diamond.

The typical weight of a four-carat diamond is regarded as a ‘large’ diamond in national and international contexts. When used in the proper setting, it is a beautiful carat weight for engagement rings and everyday jewelry. Still, it is also spectacular enough to be worn on special events and evenings out.

How Big is a 4-Carat Diamond?

An approximately 10.1mm (or around 0.4 inches) across the surface of a 4-carat diamond (the diamond’s diameter) is the size of a 4-carat diamond. Although this is predicated on the assumption that the diamond is a brilliant round cut, the diameter of other diamond shapes can vary depending on their shape and length-to-width ratio. To better understand the changes in the size of shapes, consider the figure below.

Depending on how it is cut, the average diameter of a 4-carat diamond will be 10.1mm to 10.3mm on average. When it comes to diamonds, the diameter of a 4.25-carat diamond is around 10.43mm, while the diameter of a 4.5-carat diamond is roughly 10.63mm.

Remember that elements such as the diamond’s depth (the height of the diamond measured from its top to its culet) and its table (the flat facet on the diamond’s surface) can impact the exact measurements of a diamond.

Shape Influences Size

Different shapes of diamonds appear more significant than other diamonds of the same carat weight when compared to one another. The size of diamond shapes can vary substantially, creating the illusion of a larger (or smaller) four-carat diamond than it is in reality. Because of the elongated shape of the oval diamond, it may appear more significant than a brilliant round diamond compared to the latter. Even two identical shapes, such as an Ashoka and an emerald cut, might seem different on the hand depending on how they are cut.

Cut Can Cost Carats

The cut of a diamond is not the same as the shape of the diamond. An emerald, a pear, and a round brilliant are all examples of a form. The cut of a diamond is represented by a distinct “C” in the diamond grading system, and the cut may make any shape appear brilliant or dull. The quality and precision of the cut can significantly alter the appearance of the stone, making it appear larger or smaller. The GIA has graded this “C” as Excellent, Very Good, Good, Fair, or Poor, demonstrating that diamond cutting is an art form. The brilliance of a well-cut stone will be highlighted, and the size of the diamond will be magnified.

Four Carat Perspective

Size is influenced by shape and cut, but if you’re shopping for a four-carat diamond ring, you may still get a sense of size by dividing the carat weight by the stone’s diameter (in millimeters).

Here’s how four-carat diamonds of various shapes are measured in diameter:

  • Round Brilliant: About 10 millimeters (or one centimeter) or the size of a pea.
  • Princess: About 8.7 millimeters
  • Cushion: Almost 9 millimeters
  • Heart: About 10.5 millimeters
  • Pear: Around 13 x 9 millimeters


  • 16.5x 8.25 millimeters
  • Asscher: Between 8.5 and 9 millimeters

The dimensions of four-carat diamonds demonstrate that they are not quite as huge as they appear on the surface. The diameter of a four-carat round brilliant diamond is the same size as a pea; nevertheless, even though a four-carat diamond weighs more than four times that of a 0.75-carat diamond, the diamond’s diameter is more minor than twice that of the smaller stone. Keep in mind that carat is equivalent to weight. The size of the stone, on the other hand, is governed by a variety of different elements.

The Four C’s in a 4-Carat Diamond

The greater the size of the diamond, the less forgiving it is. A more comprehensive table and the surface area mean fewer hiding spots for inclusions and a greater chance of picking up on any yellow, grey, or brown tints that may be present.

Despite this, I still recommend that you not go higher than a VVS2 in clarity and a G in color for your diamond. Although it is impossible to distinguish between higher and lower grades, the price difference can be substantial. Finding a balance between a diamond’s beauty and its price is highly dependent on a detailed analysis of the stone.

Take advantage of the technology if it is possible to find an SI1 diamond that is clean to the naked sight — a little investigation and diamond inspection can save thousands of dollars in the long run. Another factor to consider when selecting a setting is whether or not the diamond has any inclusions around the edge of the stone. When it comes to the cut, go for the highest quality possible. The cut is the key to bringing out the fire, brightness, and sparkle in a diamond, and there is a LOT to bring out in a 4-carat diamond.

Overview of Pricing for 4-Carat Diamonds

The technical variables that impact the value of your 4ct diamond will be discussed below. It’s also crucial to consider where you’ll get your diamond. When we talk about 4-carat diamonds, we’re talking about their weight, not their size. 0.8 grams, or 800 milligrams, equals 4 carats.

The cost of a diamond is determined by its carat weight. A 4.50-carat diamond, for example, could cost $23,500 per carat, and the price of the diamond would be $23,500 multiplied by 4.50 for a total of $105,750.

The price of a diamond per carat rises as the weight category rises. For example, a 3-carat diamond-like James Allen may cost $12,691 per carat, whereas a 4-carat diamond might cost $16,708.

Because of the diamond’s more considerable weight value and the higher price per carat within the weight category, the price per carat climbs exponentially with weight.

It’s crucial to pay attention to the weight ‘category’ because costs per carat don’t always rise as weight rises. Diamond prices are frequently influenced by emotion rather than logic.

While it may appear that looking for a diamond just below a new weight category, such as a 3.90-3.99 Carat Diamond, is favorable, this is not the case. Diamond cutters have improved their productivity, and finding a well-cut 3.90 Diamond is highly unusual.

What is the Best Way to Get the Most out of a 4-Carat Diamond Ring?

Our mission is to assist you in locating the most amazing 4 Carat Diamond at an affordable price. We want you to spend your money where it will be recognized and not where it will go ignored.

We advise you to examine each 4 Carat Diamond yourself or have an expert do it for you. Ensure your diamond comes with a certificate from a recognized authority, such as the GIA or AGS. It’s advised to avoid buying a diamond from a different grading entity if the seller is recommending it, especially if the diamond is 4 carats. Regardless of what their lab report shows, the diamond’s actual quality is significantly less than what the certificate claims.

Follow these tips from our experts to ensure your 4 Carat Diamond is truly stunning:

  • Shape: Choose the Diamond Shape that appeals to you and the wearer. Choose a setting that will keep your stone stable.
  • Cut: Select diamonds with an excellent cut or a GIA Excellent rating. More than any other factor, an expertly cut diamond maximizes the diamond’s brilliance and fire.
  • Clarity: Look for diamonds with a clarity grade of VS1 or VS2. This will give you the most bang for your buck regarding what can be seen with the naked eye. At these grades, blemishes and imperfections are invisible.
  • Color: Consider diamonds in the G to I color range, which is colorless. These diamonds will be transparent to the human eye and far less expensive than diamonds in the D to F classifications.
  • Diamond Vendor: Purchase your diamond from a reputable retailer like Abe Mor Diamonds, Brian Gavin Diamonds, James Allen, or the Blue Nile.

Is a 4-Carat Diamond a Lot?

According to national and international standards, a 4-carat diamond is considered a ‘large’ diamond. 4-carat diamonds are precious if they have the correct clarity, cut, shape, and color. Most people who hunt for 4-carat diamonds are drawn to them because of their exceptional attributes.

By national and international standards, a four-carat diamond is considered a ‘large’ diamond. It’s a beautiful carat weight for engagement rings and everyday jewelry in the correct setting, but it’s also spectacular enough to save for evenings and special occasions.

What is the Best Place to Buy a 4-Carat Diamond Ring?

When I write these articles, I usually start with background information on the 4 Cs and other more technical aspects of diamond purchasing. Still, in the instance of a 4-carat diamond, the most critical question is where you should begin your search. So, before we go into the technical difficulties of buying a diamond of this weight, there are a few things to keep in mind when searching for one.

As a result, you’ll most likely find more selections online than in-store. By browsing through reliable retailers on the internet, you can get a unique ring at an affordable price. Purchasing a diamond ring online rather than in-store can save up to 30-40 percent.


Purchasing a 4-carat diamond is not a decision to be taken lightly. Please make sure that the shape, cut, clarity, and color of your 4-carat diamond is precisely what you want before purchasing it. 4-carat diamond rings are a luxury item since they are rare, bold, and expensive. The weight of a four-carat stone will be noticeable when worn on the hand, even if the millimeter measurements aren’t as significant as they are with smaller carat weights.