How Do You Tell How Many Carats a Diamond is

How Do You Tell How Many Carats a Diamond is

How Do You Tell How Many Carats a Diamond is

Posted by Sharif Khan on 26th Jan 2021

Diamonds is the most expensive and highly anticipated gems which the rich anticipate to have, it is graded according to the 4 Cs - Color, Carat, Clarity and Cut.

The Carat refers to the mass of the diamond. One carat is about 200 milligrams. Diamonds with less than one carat is commonly referred to as equal to one one-hundredth of a carat (0.01 carat, or 2 mg). Generally, the price per carat of a diamond increases directly proportional to carat weight.

The word "carat" originated from the Greek word keration, which means "fruit of the carob tree." In ancient times, the seeds of the carob pod were used as a standard for weight measurements, since the size of their seeds were almost always identical. Therefore, it is also the term used to express the weight of a diamond.

James Allen

Ct is the abbreviation of a carat and it refers to the weight of a single stone. It is used to express the total weight of multiple stones that are used in a piece of jewelry. The weight of smaller diamonds is called a points. There are 100 points in a carat. One way to look at it is to say that each point equals 0.01 or one-hundredths of a carat. For example, 0.25 means twenty-five one-hundredths. So a 0.25-carat diamond would equal twenty-five points of one-quarter of a carat.

Diamond carats are often confused with stone sizes when it is actually a measure of weight. It is for this reason that people seem to think that a higher carat means a bigger diamond. The cut of a gemstone can make it appear larger or smaller than its actual weight. As a result, it is possible to have 2 diamonds of the same carat weight appear to be different sizes. When a gemstone is cut in appropriate sizes, the maximum amount of light is returned out of the top of the stone, making it appear larger. In a poorly cut diamond, much of its weight may be hidden in its base, making it appear smaller than its weight would imply.

It makes sense that the more carats a diamond has, the more expensive it is. But it isn't as simple as saying that a 1 carat stone costs exactly half as much as a two carat stone. That would be called "thinking rational" and nothing about diamonds is rational. A 1 carat stone, for instance, costs far more than twice that of a half carat stone. And so on and so forth. And the reason for that is because larger diamonds are rarer than smaller ones. When they're being pulled out of the earth, smaller assorted diamonds are far more likely to be found that big, whopping ones. And that's why the larger single stones are far more expensive the more that they weigh.

A good rule of thumb to remember is that the closer you get to each subsequent carat, the more expensive the diamond will be. Let's suppose that you have a 0.8ct stone. Logically, you'd think that getting the full carat wouldn't be much of a jump in price. But indeed it is. Even the difference between a 0.9 stone and a full carat is somewhat outrageous.


Diamonds are sold with a carat (ct.), Which is actually a unit of weight, although most thoughts on carat are that it is the terms size, carat is the original measuring units for diamond merchants. Today the carat is exactly 0.2 grams (around the weight of the thrombus). Carat weight is not related to the comparable sound karate, which refers to the purity of gold.

Two diamonds of the same carat weight can have very different costs, depending on other factors (such as cut, color, and clarity). To understand the significance of carat weights, If the heart of the receiver is set to a diamond of a certain size, the weight of the carat is probably the most important factor in the search until you reach the desired size.

As the carat diamond size increases,  the price of a diamond. Because of the bigger the diamond, and which make it rarer.

Two diamonds of the same shape and of the same carat weight may still appear in different sizes, depending on the cutting ratio. The deep cut diamond has a large part of its total weight "hidden" in the depth, resulting in a smaller diameter than a well-cut diamond. These differences are mostly small, but unpredictable. A well-cut diamond can also have a slightly lower carat weight than a deep diamond and still has a larger diameter that makes it larger.


Two diamonds of the same weight in the carat can also have very different sizes, depending on the diamond shape. For example, the 1-carat code appears to be larger than the 1-carat round. The following table illustrates why. For each diamond chart, the following is shown:

Size Estimate: The diamond-shaped images represent a very approximate of the right size of an excellent 1 carat cut for each shape. Visually, longer forms (ovals, awnings, pears,  emeralds) seem to look larger than  round and square shapes.

Measures (Length X Width): The measurement corresponds to the above-mentioned form and is characteristic of diamonds of great size with a weight of 1 carat.

Crown Area: total area (mm2). The area shows the actual size of the diamond with the front side up (as it appears on the ring). For example, while the  oval diamond image is larger than a circular image, the actual surface is the same for both shapes, which means that the difference in size is one of the perceptions, not the reality. On the contrary, the oval appearance not only has a greater appearance than the size of a princess cut, but the surface is larger (about 10% higher in this example), which means that the difference is not only an illusion created by an elongated shape.


It is important to distinguish between size and weight. Diamonds sell by carats but that doesn't necessarily equate to "more carats equal a bigger size." The cut of the diamonds can play a big part and the naked eye, along with the tricks light plays, can fill in the rest. A Round Brilliant, for instance, can be essentially the same size as a pear-cut but look smaller just because of its shape and cut. A one-carat princess cut, for instance, may be about five and a half millimeters in diameter from the top, while a heart-shaped cut is closer to seven millimeters across the top. But, again, that doesn't mean that one will look bigger than the other until we learn about the cut grade of each stone.

Even if diamonds have an identical shape and weight, they don't necessarily have the same size. Diamond carat size is determined by how it is cut (dimensions) and its depth. A diamond that has less depth has a larger diameter (size) and vice versa. Doubling diamond carat weight does not double size since the diamond is larger in both diameter and depth.


Each shape has a unique look. Diamonds with the same weight but are cut to different shapes will have different sizes (diameter and depth), so some shapes appear to be "larger" than others. Preference of shape is individual. Most diamonds are cut to "Round" shape, but many shoppers prefer other shapes.


Cut quality greatly influences appearance. A well-cut diamond looks like a "Fireball" and seems larger because weight and dimensional size are optimal and correlate. The worth of a well-cut diamond is also higher because of the amazing difference with other ordinary looking diamonds.


The Rappaport Diamond List sets the diamond prices. Weight has the largest impact on price and is followed by clarity, color, and cut quality. Larger diamonds are rarer and cost more than smaller ones when clarity, color, and cut are equal. Doubling weight quadruples total cost (not price per carat). Sometimes larger diamonds are cut to retain a higher weight and price; this will compromise the cut quality and appearance.

Round and fancy shapes are priced separately. Round diamonds cost more because demand is higher - 65% of the market. Cutting into a round shape causes loss of more material in comparison to any other shape.

Diamond Carat Weight Main Classes Are:

  • 0.50-0.69CT • 0.70-0.89CT • 0.90-0.99CT • 1.00-1.49CT • 1.50-1.99CT • 2.00-2.99CT • 3.00-3.99CT • 4.00-4.99CT • 5.00-9.99CT • 10.00 CT and up
  • Price differs by percentage between weight classes, so the best value diamonds are close to the upper limit of the weight class below your target. For example, a 0.94 Carat diamond will look very similar to 1.00 Carat diamond but will cost between 8 - 20% less (when color, clarity, and cut are the same).


    Bigger diamonds aren't necessarily better. Maintaining the right proportion between diamond and wearer is important.


    Larger diamonds are more expensive so you have to consider this when buying one. But rest in the fact that you can find a great looking diamond within your budget range.


    "Total weight" is different from carat weight since it represents the total weight of diamonds in a piece of jewelry. For example, a pendant with 3 set diamonds will have a total weight of 1.23 and that the weight of all three diamonds is 1.23 Carats.

    When size is important, one should compromise on clarity or color but not the cut quality - since the cut quality determines the diamond looks and sparkle.

    Choosing one size category smaller can save you money.


    Question: Is Carat The Size Of The Diamond?

    Answer: While it is often confused with the size, carat is the weight of a diamond. While the size of one carat is the equivalent of 200 milligrams, it is usually communicated in terms of "points." Diamonds are measured based on a 100-point scale. Therefore, a.50 carat diamond is also referred to as a 50 point or 1/2 carat diamond.

    Question: How Is The Size Of The Diamond Determined?

    Answer: The size of a diamond is evaluated by viewing it from the top, or a birds-eye view of the diamond. The perspective is used because it is representative of how the diamond will appear when it is set on the band. To get an accurate reading of the diamond size and carat weight, both need to be measured in conjunction with the diamond cut grade, and the distance across the top of the diamond (in millimeters).

    Question: Is There A Scale That Determines The Size Of The Diamond?

    Answer: Yes, Carat weight is categorized in the following manner:

  • Quarters: .25 carat or 24 - 29 points
  • Thirds: .33 carat or 30 - 39 points
  • Two-fifths: .40 carat or 40-49 points
  • Half carat: .50 or 50- 59 points
  • Three-fifths: .60 or 60 - 69 points
  • Three-quarters: .75 or 70-79 points
  • Four-fifths: .80 or 80-89 points
  • Nine-tenths: 90 - 99 points
  • Carat: 100 points

  • Question: Is The Pricing Of Diamonds Correlated To The Point Scale?

    Answer: The pricing of diamonds is a tricky subject. Since larger diamonds are rarer, the cost of these diamonds is often considerably more. Diamond prices especially increase at the full- and half-carat weight classifications. Diamonds just below these weights often cost significantly less, and, because carat weight is distributed across the entirety of the diamond, small size differences are almost impossible to detect.

    Question: What Are The Factors That Affect The Pricing Of Diamonds?

    Answer: The appearance of a diamond also affects its price tag. In additional to carat, the shopper must consider the remaining three of the four C's in terms of diamond ring pricing. The color, cut, and clarity and how it is mounted all have a significant impact on the pricing and value of a diamond carat ring.

    So What Does TCW Or CTW Mean?

    Total Carat Weight or Carat Weight Total describes the total weight of all the diamonds in a piece of jewelry. For example, a diamond pendant that has a dozen diamonds in it may have a ctw of 2 carats.

    Another thing to remember when buying a diamond based on carat size is making a balance between quality and size. A larger high-quality diamond can be found by selected a grade which is slightly lower in terms of  diamond color and quality. To the unaided and inexperienced eye, diamond carat can be hard to tell by simply looking.