When discussing the world of gemstones, understanding the term "carat" is essential. A carat is a unit of measurement used specifically for weighing precious stones such as diamonds, rubies, and sapphires. Knowing the size and weight of a gemstone not only helps in determining its value but also plays a crucial role in the design and appearance of a piece of jewelry.
Table Of Contents
- Understanding Carat as a Unit of Measure
- Origin of Carat Measurement
- Carat Weight and Diamond Size
- Impact of Diamond Size on Price
- Diamond Shapes and Carat Size
- Carat Size in Different Types of Gemstones
- 4Cs and Carat Size
- Carat Weight and the Appearance of Diamonds
- Carat Size and Engagement Rings
- Role of Traders in Determining Carat Size
- Diamond Education and Carat Weight
- Lab Grown Diamonds and Carat Size
- Rose Diamonds and Carat Size
- Point System and Carat Size
- Frequently Asked Questions
A single carat is equivalent to 200 milligrams, or 0.007055 ounces. It is important to note that carat weight does not necessarily equate to the physical size of a gemstone, as different gemstones have varying densities. This means that two stones with the same carat weight may appear different in actual size depending on their unique properties. Understanding how big a carat is can be vital in making informed decisions when purchasing or appraising gemstones and jewelry.
To better visualize the size of a carat, consider that a one-carat round diamond typically measures around 6.5 millimeters in diameter. Comparatively, a one-carat ruby or sapphire might appear slightly smaller due to their higher densities. By having a better grasp of carat sizes and how they relate to the physical appearance of gemstones, individuals are better equipped to prioritize factors such as size, quality, and value within the fascinating world of precious stones.
Understanding Carat as a Unit of Measure
Carat is a widely used unit of measurement for gemstones, including diamonds, and pearls. The concept of carat originates from the practice of ancient traders using carob seeds as counterweights, due to their relatively uniform size and weight. However, the carat is now standardized and defined as 200 milligrams or 0.2 grams in the metric system.
The carat weight is further sub-divided into smaller units called points. One carat consists of 100 points. This enables precise measurement and evaluation of gemstones, even when they are less than a carat in weight. For example, a gemstone weighing 50 points would be equal to 0.5 carats.
The metric carat system was adopted internationally in 1907 at the Fourth General Conference on Weights and Measures. This move aimed to standardize the measurement of gemstones globally, making it more consistent and easier to compare. Prior to this standardization, different countries and regions followed their own versions, often facing confusion in the measurement and valuation of gemstones.
As part of the metric system, the carat is compatible with other units of measurement like grams and kilograms. Gems are typically evaluated using a precise scale, which accurately measures their weight in carats, ensuring consistent evaluations across the industry.
It is essential to note that carat refers exclusively to the weight of a gemstone and not its size or dimensions. Two gemstones of the same carat weight may appear different in size due to their varying shapes, proportions, and densities. As such, carat weight should not be the sole determinant of a gem's value, as factors like color, clarity, and cut must also be considered.
In conclusion, understanding the carat as a unit of measure is crucial for accurately evaluating and comparing gemstones. Its adoption as a standard unit worldwide has simplified transactions and increased consistency across the gemstone industry. While carat weight is an important aspect of evaluating gems, it is essential to consider the overall qualities of a gem for a comprehensive understanding of its value.
Origin of Carat Measurement
The carat measurement has an interesting history that dates back to ancient times. Its origin can be traced to the carob seed, which was utilized as a standard unit of weight for small quantities due to its relatively uniform size. The word 'carat' itself is derived from the Greek word 'keration', referring to the carob seed and the fruit of the carob tree.
The consistent nature of the carob seed's weight made it a perfect choice in early societies for measuring valuable items such as gemstones and gold. The connection between carob seeds and weight measurement can be observed in numerous historical mentions. For instance, it is found that carob seeds were long-associated with weight measurements and even influenced the measure of gold purity, also known as carat or karat, depending on the region.
As trade and commerce advanced, various cities established standardized measurement systems for gemstones and precious metals. London, Florence, and Amsterdam are some examples of cities that played a crucial role in the evolution of the carat measurement used today. These cities encompassed influential trade centers which contributed to the widespread adoption of a unified carat system.
The modern carat system, which is now internationally recognized, specifies that one carat is equivalent to 200 milligrams or 0.007 ounces. This precise measurement ensures accuracy and consistency across the gemstone and precious metal industries.
It is fascinating to see how a humble carob seed from the carob tree has had such a significant impact on the way precious items are measured and valued. The carat system continues to be a universally accepted method for weighing and assessing the worth of gemstones and precious metals throughout the world.
Carat Weight and Diamond Size
|Round MM Size||Round Carat Weight|
|4.0mm diameter||0.25 ct|
|5.1mm diameter||0.5 ct|
|5.8mm diameter||0.75 ct|
|6.4mm diameter||1.0 ct|
|6.9mm diameter||1.25 ct|
|7.3mm diameter||1.5 ct|
|7.7mm diameter||1.75 ct|
|8.1mm diameter||2.0 ct|
|8.5mm diameter||2.25 ct|
|8.9mm diameter||2.5 ct|
*Sizing of diamonds is based on averages for a brilliant round diamond. Consult with a
The relationship between carat weight and diamond size is not always linear. For example, a 1-carat diamond might not appear to be twice as large as a half-carat diamond. To better understand the relationship between carat weight and diamond size, it's important to consider the length, width, and surface area of the gemstone.
While carat weight refers to the weight or mass of a diamond, the physical size is often measured by its diameter or length and width dimensions. Typically, a round diamond will have a single diameter measurement, while a fancy-cut diamond, such as an oval or marquise, will have separate measurements for its length and width. A diamond size chart can be helpful in visualizing these variations in size.
The surface area of a diamond can also impact its perceived size. A diamond with a larger surface area may appear bigger to the naked eye, even if it has the same carat weight as another diamond with a smaller surface area. This is because the surface area is determined by the diamond's cut, which can affect the way it reflects light and appears to the observer.
It's worth noting that the diameter of a diamond can provide a good indication of its face-up size since this is the measurement that is most easily visible when viewed from the top. However, the overall appearance and visual impact of a diamond will also be influenced by factors such as its shape, cut quality, and proportions. A well-cut diamond will typically appear larger and more brilliant than a poorly-cut diamond with the same carat weight.
To sum up, understanding the relationship between carat weight and diamond size involves considering factors such as length, width, surface area, and diameter. While carat weight is an important aspect of diamond size, physical dimensions and cut quality also play a crucial role in determining the overall appearance and visual impact of a gemstone.
Impact of Diamond Size on Price
When considering purchasing a diamond, it is critical to understand the relationship between its size and its price. Diamonds are measured in carats, with one carat equaling 200 milligrams or 0.007 ounces. The price of a diamond is influenced by a variety of factors, including its carat weight.
Larger diamonds, particularly those approaching or exceeding a full carat, tend to have a higher price per carat compared to smaller diamonds. This is because larger diamonds are rarer and have a greater visual impact, making them more desirable in the market.
It is important to be aware that a diamond's price is not solely determined by its size. Other factors, such as cut, color, and clarity, contribute to the overall value of a diamond. Nevertheless, when comparing two diamonds with the same qualities, the larger one will typically be more expensive.
For those on a budget, considering a half-carat diamond instead of a full carat can result in significant savings. Diamonds slightly smaller than popular sizes, such as 0.9 carats instead of a full carat, often have a lower price per carat. This small difference in size may not be noticeable to the untrained eye but can make a substantial difference in price.
It's essential to balance size with other diamond attributes, as a larger diamond with poor cut, color, or clarity may not be as valuable as a smaller, higher-quality stone. Ultimately, selecting a diamond is a personal decision that should take into account individual preferences, budgets, and the impact that size has on price.
Diamond Shapes and Carat Size
When discussing diamond shapes and carat size, it's essential to understand the relationship between cut, shape, and carat weight. The cut of a diamond refers to the quality of its proportions, symmetry, and polish, while the shape is the overall outline or contour of the stone.
Different diamond shapes have distinct characteristics that can affect their carat size, which is a unit of weight equal to 0.2 grams. Some of the most common diamond shapes include round, pear, oval, marquise, princess, cushion, and heart. Round brilliant diamonds, for example, are known for their exceptional light performance and brilliance, and tend to maximize a stone's carat weight.
Pear-shaped diamonds, which feature an elongated shape with a pointed end, have a unique appeal and often appear larger than other shapes of similar carat weight. The oval diamond, often considered a more fashionable choice, similarly benefits from elongation, making it appear larger than round diamonds of equal weight.
Marquise diamonds also possess an elongated outline with pointed ends, and their distinctive shape allows for the appearance of a larger size. Meanwhile, the princess cut is a popular square-shaped diamond that can offer excellent light performance, depending on the proportions, and may appear heavier than other shapes due to its more defined angles.
Cushion diamonds, defined by gently rounded corners and a classic square or rectangular shape, also have a stunning appearance. These stones tend to have a slightly lower carat weight compared to other shapes, but their unique design compensates for this in beauty. Heart-shaped diamonds, given their intricate design, may sometimes carry a premium over other shapes, but their romantic appeal continues to draw interest.
In summary, different diamond shapes can significantly impact the perceived carat size and overall appearance of a stone. The cut and craftsmanship of a diamond play a vital role in determining its beauty, and careful consideration of shape is necessary when choosing a diamond that maximizes the carat weight while showcasing the stone's unique features.
Carat Size in Different Types of Gemstones
Gemstones come in various sizes and shapes, and one of the ways to measure their size is by carats. In this section, we will explore the carat sizes in different types of gemstones such as emeralds, pearls, and other precious gems.
A carat is a unit of measurement used for gemstones, with one carat equal to 0.2 grams or 200 milligrams. It is important to note that carats measure weight, not size; thus, two gemstones of the same carat weight may appear different in size due to differences in density and cut.
Emeralds are a variety of the mineral beryl, known for their vibrant green color. These precious gemstones can vary greatly in size, from small fragments to large specimens weighing over 100 carats. Large emeralds of 30-40 carats are considered rare, and their value increases exponentially with size, especially when accompanied by exceptional color and clarity.
Pearls are unique among gemstones as they are formed within the shells of mollusks, such as oysters and mussels. The size of pearls is measured in millimeters, mainly due to their spherical shape, but their weight can also be expressed in carats. Pearls are commonly found in sizes ranging from 7-8 millimeters, while larger pearls of 20 millimeters or more are exceptionally rare. The weight of a pearl can vary based on its composition; for example, a 10-millimeter pearl may weigh around 3.5 carats.
In addition to emeralds and pearls, there are other precious gems like rubies, sapphires, and diamonds. Rubies and sapphires, both from the corundum family, come in a wide range of sizes, from small melee-sized stones of less than one carat to large specimens weighing tens or even hundreds of carats. The sizes of diamonds also vary, with smaller ones commonly found in jewelry and larger stones often considered investment pieces or collector's items. Large diamonds above 100 carats are extremely rare and possess immense value.
In conclusion, the carat size of gemstones can vary greatly depending on the type of gem and its formation process. Emeralds, pearls, and other precious gems such as rubies, sapphires, and diamonds demonstrate this diversity, but it is essential to remember that carats measure weight, not physical dimensions.
4Cs and Carat Size
Carat is the unit of measurement used to express the weight of a diamond and directly impacts its size, though the size can also be affected by the cut. One carat is equal to 200 milligrams or 0.007055 ounces. Generally, as carat size increases, the diamond's value also goes up because larger diamonds are rarer and in higher demand. However, it is essential to consider the other 4Cs - color, clarity, and cut - in determining a diamond's overall value, attractiveness, and quality.
- Color refers to the hue of a diamond, which can vary from colorless to slightly yellow or even have a brown or gray tint. The Gemological Institute of America (GIA) has a color grading scale ranging from D, which represents colorless diamonds, to Z, indicating diamonds with noticeable color. Diamonds with fewer color impurities are deemed more valuable, and their prices increase as they approach the colorless range.
- Clarity is an evaluation of a diamond's internal and external imperfections or inclusions. The fewer inclusions a diamond has, the better its clarity grade, and the more valuable it becomes. The GIA's clarity scale ranges from Flawless (no visible inclusions under 10x magnification) to Included (inclusions and blemishes visible to the naked eye).
- Cut refers to a diamond's proportions, symmetry, and polish, which affect its ability to reflect light and, ultimately, its beauty. A well-cut diamond will have an optimal balance between brilliance (reflected white light), fire (dispersion of light into colors), and scintillation (flashes of light when the diamond is moved). A better cut can make a diamond appear larger and more attractive than its carat size may suggest.
Considering the 4Cs when assessing a diamond helps to understand its true value and beauty. Carat size is an essential factor, but in the presence of a poor cut, low clarity, or less desirable color, a larger diamond may not necessarily be more valuable. It is crucial to balance these aspects to find the perfect diamond that meets individual preferences and budget.
Carat Weight and the Appearance of Diamonds
A diamond's carat weight plays a significant role in its overall appearance and is often one of the primary considerations when selecting a gem for jewelry. Although seen as a measure of size, the carat weight does not always correlate directly with a stone's diameter and depth, as factors such as cut and proportions also impact size perception.
One carat is equivalent to 200 milligrams or 0.007 ounces, meaning that a gem with a higher carat number will possess more weight. However, two diamonds with the same carat weight may have different dimensions based on their individual proportions. For example, a shallow-cut diamond may appear larger in diameter, while a deep-cut diamond might seem smaller but have more depth.
The cut of a diamond is crucial in determining its sparkle, beauty, diameter, and depth. A well-cut diamond, regardless of carat weight, can exhibit exceptional beauty by reflecting light optimally, producing stunning sparkle and fire. In contrast, a poorly cut diamond may seem dull, even if it has a higher carat weight. This is because cut quality directly influences a diamond's ability to interact with light – a critical factor in assessing a gem's beauty.
When choosing a diamond, it is essential not to base decisions solely on carat weight, as the appearance of size is also influenced by various factors, such as:
- Cut proportions: The balance between the diameter and depth of a diamond.
- Table size: The large, flat surface on the top of the diamond that reflects light.
- Girdle: The narrow band running around the edge of the diamond, which can either be very thin or thick, affecting the overall size appearance.
Ultimately, the selection of a diamond that satisfies one's preferences should involve careful consideration of its carat weight, dimensions, and proportions, to ensure a beautiful and eye-catching gem. By focusing on the balance between these factors, a buyer can find a diamond that best suits their desired size, sparkle, and beauty.
Carat Size and Engagement Rings
When it comes to choosing a diamond engagement ring, one important factor to consider is the carat size of the diamond. A carat, the unit of measurement for gemstones, specifically measures the mass of the stone. One carat is equivalent to 0.2 grams or 200 milligrams. For diamonds, carat size is directly related to the perceived value and beauty of the stone. However, it is essential to remember that the carat weight alone does not determine the overall quality and value of a diamond engagement ring. Other factors like cut, clarity, and color also play crucial roles.
A one-carat diamond is considered a significant milestone both symbolically and visually when it comes to engagement rings. With higher carat sizes, the diamond becomes more noticeable and, in some cases, more desirable. A one-carat diamond has an average diameter of approximately 6.5 millimeters. It is important to note that the actual size of a one-carat diamond can vary slightly due to differences in cut, shape, and other factors.
The appearance of a one-carat diamond on the finger can vary, depending on the size and shape of the hand and finger. On smaller fingers, a one-carat diamond may appear larger, while on larger fingers, it might appear more proportionate or even smaller. The size and design of the engagement ring, as well as the setting and style, can influence the perception of the diamond's size and impact on the finger.
When selecting an engagement ring, it is essential to find a balance between carat size and other aspects of the diamond's quality, such as cut, clarity, and color. A higher carat weight might be impressive, but a lower carat diamond with exceptional cut, color, and clarity might be more visually stunning and valuable. Ultimately, the choice of carat size for a diamond engagement ring should reflect the preferences, budget, and personal style of the wearer.
Role of Traders in Determining Carat Size
Traders play a significant role in the diamond industry, particularly when it comes to determining carat size. Carat size is one of the critical factors that influence the value of diamonds, and it is the responsibility of traders to ensure that diamonds are accurately weighed and categorized. The process of determining carat size involves several essential practices, such as measuring, pricing, and certification, all of which are meticulously carried out by traders.
In the United States, well-established companies such as James Allen and Blue Nile have a reputation for ensuring customers receive diamonds that are correctly weighed and priced. These traders rely on advanced technology and expert knowledge to achieve this accuracy in determining carat size.
In the diamond industry, traders are also responsible for creating a transparent marketplace where buyers and sellers can confidently exchange goods. This transparency is achieved through the use of standardized grading practices, such as the Gemological Institute of America's (GIA) methodologies, which ensure that diamond carat sizes are consistently measured across the industry. By adhering to these standards, traders play a crucial role in maintaining trust between buyers and sellers.
It is worth noting that the role of traders in determining carat size goes beyond just ensuring accuracy. Traders also contribute to the supply chain by sourcing diamonds from mines, getting them cut, and then distributing them to the market. This process requires a thorough understanding of the market dynamics, such as fluctuating diamond prices and consumer preferences. By keeping abreast of these market trends, traders can make informed decisions about the carat sizes they trade, ultimately shaping the industry and the availability of particular carat sizes.
In conclusion, traders are an essential part of the diamond industry when it comes to determining carat size. They are responsible for measuring, pricing, certifying, and distributing diamonds, ensuring that the carat sizes of diamonds traded in the market are accurate, consistent, and in line with industry standards. Their expertise and understanding of the market dynamics also play a crucial role in shaping the availability and trends for specific carat sizes.
Diamond Education and Carat Weight
When discussing diamond education, one of the key factors to consider is carat weight. A carat is a unit of measurement used to express the weight of a diamond. One carat is equivalent to 0.2 grams or 200 milligrams1. It is essential to understand that carat weight does not always directly correspond to the size or the diameter of a diamond.
The Gemological Institute of America (GIA) is a reputable organization that provides education and certifications for diamond grading. As per GIA, the carat weight of a diamond plays a significant role in determining its value along with other factors such as color, clarity, and cut.
In the process of diamond education, it is important to understand that two diamonds of the same carat weight can have different values. This is based on the fact that the other key factors, like the quality of cut, color, and clarity, can greatly impact the overall price and appearance.
When choosing a diamond, it is essential not to focus solely on the carat weight but to consider a balance of all the other factors, including the cut, clarity, and color of the diamond. This approach ensures that the diamond you select is of the best quality and value for its carat weight.
It is also necessary to remember that diamond weight does not always correlate with the visual size or appearance of the diamond. The cut of the diamond can influence how large or small a diamond appears when observed from the top view. A well-cut diamond will have a better light performance and appear larger, even if it has a slightly lower carat weight.
In conclusion, when discussing diamond carat weight as part of diamond education, it is important to understand the role carat weight plays in determining the value of a diamond while also considering other key aspects such as cut, color, and clarity. A well-informed approach will help you select the perfect diamond for your needs with the right balance of price, carat weight, and overall quality.
Lab Grown Diamonds and Carat Size
Lab grown diamonds have been steadily gaining popularity as an environmentally friendly and cost-effective alternative to mined diamonds. These diamonds are created using advanced techniques such as High Pressure High Temperature (HPHT) and Chemical Vapor Deposition (CVD), both of which are able to replicate the natural diamond formation process.
One of the key factors to consider when purchasing a diamond is its carat size, which refers to the weight of the gemstone. Lab grown diamonds can significantly vary in carat size, depending on the growth methods and conditions used during their production.
In some cases, lab grown diamonds have been created in impressively large sizes. For instance, researchers have successfully grown diamond crystals up to 1 carat using the HPHT method. This success, however, was initially considered too expensive and time-consuming for commercial use, but advancements in technology have led to improvements in both the process and the size of lab grown diamonds.
As a result, lab grown diamond producers have managed to break records in recent years, with some companies even producing synthetic diamonds as large as 5.13 carats, like the pear-shaped diamond made by a facility in St. Petersburg. Another remarkable example is the creation of synthetic diamonds that are as large as 4.0 carats and up to 9 mm in size at 1550 C, as cited in a study by ScienceDirect.
Advancements in lab-grown diamond production techniques have unlocked the potential for these gemstones to be available in a wide range of carat sizes. This offers consumers more options when selecting the perfect diamond, without sacrificing quality or appearance. As technology continues to improve, we can expect lab grown diamonds to reach even larger sizes in the future, further solidifying their place in the gemstone industry.
Rose Diamonds and Carat Size
Rose diamonds, also known as pink diamonds, are highly sought after in the diamond purchase process due to their rarity and stunning colors. The size of these precious stones is usually measured in carats, which is a unit of mass equivalent to 200 milligrams or 0.007 ounces, commonly used for gemstones and pearls.
When talking about carat size, one might assume that larger diamonds automatically equate to higher value. However, in the case of rose diamonds, carat size is only one of the factors influencing their worth. The grading criteria for diamonds, known as the 4Cs – carat, cut, color, and clarity – all play a significant role in determining their value.
In general, rose diamonds tend to be smaller on average, with polished pink diamonds averaging about one carat. However, there are some notable examples of larger pink diamonds that have been discovered. For instance, stones in the 10.8 ct size fraction have been known to exceed a value of US$25,000/ct. Despite their smaller size, these alluring gemstones remain popular choices in the high-end luxury market due to their captivating hues and increasing scarcity.
The rarity of rose diamonds stems from their unusual formation process within the Earth's mantle. While most diamonds are formed under high pressure and temperature conditions, pink diamonds owe their color to a unique combination of pressure-related distortions in their crystal lattice structure paired with trace elements such as nitrogen.
As the demand for these exceptional gems continues to grow, advancements in technology have made it possible to produce synthetic diamonds, including rose diamonds, through high-pressure, high-temperature (HPHT) processes. Although these synthetic diamonds are more affordable and available in larger carat sizes, they may not always possess the same natural attributes that make natural rose diamonds so sought after.
In conclusion, when considering the carat size of rose diamonds, it is essential to remember that their true value lies not only in their size but also in their exquisite color, rarity, and overall quality as determined by the 4Cs grading criteria.
Point System and Carat Size
The point system is a common method used to measure the size of diamonds and other precious gemstones. Each carat is divided into 100 equal parts called points. A single point equals 0.01 carats, which means that a half-carat diamond, for example, has 50 points.
Understanding the point system is essential for both buyers and sellers, as it provides an accurate and standardized measurement for gemstones. It allows for the comparison of gems based on consistently defined criteria, which in turn facilitates transparent pricing and educated decision-making.
When discussing carat size, it is important to distinguish it from the overall value of the gemstone. Carat size refers to the weight of the stone, not its dimensions or quality. A larger carat size does not necessarily equate to a more valuable gem, as factors such as clarity, color, and cut must also be considered when assessing a gemstone's worth.
Nonetheless, carat size is a significant factor affecting a gem's value. Larger gemstones tend to be rarer, making them more valuable. As a result, buyers often seek stones with a higher number of points, resulting in a larger carat size.
It is worth noting that when comparing gemstones with similar carat sizes, the one with higher points may not always appear larger. This is because the cut of the gem can impact its overall appearance. More precisely, a well-cut stone may appear larger than a poorly cut one, even if the latter has a higher carat size.
In conclusion, the point system provides essential information for accurately comparing and pricing gemstones, with carat size being one of the crucial factors in determining their overall value. While carat size is a significant aspect to consider, it is important to remember that the gem's clarity, color, and cut must also be taken into account for a comprehensive assessment of its worth.
Frequently Asked Questions
What is the size of a 1 carat diamond in millimeters?
A 1 carat diamond typically measures around 6.5 millimeters in diameter. However, this measurement may slightly vary depending on the diamond's cut and shape.
How does a 1 carat diamond's price relate to its size?
The price of a 1 carat diamond is not directly proportional to its size. Instead, it depends on various factors such as cut, color, clarity, and carat. As the carat weight increases, the price per carat usually increases as well, but at a nonlinear rate. For example, a 2-carat diamond may cost more than twice the price of a 1-carat diamond with the same cut, color, and clarity.
What does a 1 carat diamond look like on a hand?
A 1 carat diamond may look different on various hand sizes and shapes. It looks more prominent on smaller fingers, whereas it may appear slightly smaller on larger fingers. Regardless, a 1 carat diamond often looks elegant and substantial on most hands.
What is the weight of a 1 carat diamond in grams?
A carat is a unit of weight for gemstones, with 1 carat being equivalent to 0.2 grams. Therefore, a 1 carat diamond weighs 0.2 grams.
How large is a 25-carat diamond compared to a 1-carat?
A 25-carat diamond is significantly larger than a 1-carat diamond. However, the exact size difference depends on factors such as cut and shape. Generally, a 25-carat diamond can measure around 18 millimeters in diameter, which is almost three times the diameter of a 1-carat diamond.
What is the size difference between a 1 carat and a 2 carat diamond?
The size difference between a 1 carat and a 2 carat diamond can be significant, depending on their cut and shape. Generally, a 2 carat diamond has a diameter that is about 1.5 to 1.7 times larger than that of a 1 carat diamond. For example, a 1 carat diamond might have a diameter of 6.5 millimeters, while a 2 carat diamond could have a diameter of around 8 to 8.8 millimeters.
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