VANBRUUN Editorial
The relationship between size and carat in diamonds
How does carat affect a diamond’s size? Many assume that carat equals size, but carat actually refers to weight, not diameter. The shape, cut, and proportions of a diamond greatly influence how large it appears. A smaller carat diamond can look bigger than a heavier one if it is well-cut. This guide explains the difference between carat and visual size, and why prioritizing cut over weight ensures your diamond shines at its best. Read on to discover how to maximize your diamond’s impact.
What you need to know about carat weight
Carat is the unit of measurement used to determine a diamond’s weight. One carat equals 0.2 grams, but there’s more to it than just the weight. In the diamond industry, carat weight is often further broken down into “points.” One point equals 0.01 carat, meaning that 100 points equal one carat. When you hear about carat weight, it’s always referring to the polished diamond, not the raw stone.
You may also encounter the term Carat Total Weight (CTW), which refers to the combined carat weight of multiple diamonds in a piece of jewelry, such as in eternity rings or necklaces.
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How diamond shape and cut influence size
While carat weight is an important factor, it does not tell the whole story. The shape and cut of a diamond have a significant impact on its appearance. A diamond with a smaller carat weight can actually appear larger depending on how it is cut and its shape.
Think of it like body weight and physique. While weight is a number, it doesn’t tell you much about the body’s shape or size. The distribution of weight, whether concentrated or spread out, has more to do with appearance than the weight itself. Similarly, the cut and shape of a diamond determine how it reflects light, affecting its perceived size.
The relationship between carat and diameter
It is important to note that a diamond's diameter does not increase linearly with its carat weight. For example, a 2-carat diamond is not twice as large as a 1-carat diamond, even though it is twice as heavy. A well-cut 1-carat diamond typically has a diameter of about 6.5mm, while a 2-carat diamond is around 8.0mm. The difference in diameter is just 1.5mm, which may seem small, but it can noticeably impact the overall appearance.
Diamonds of larger carat weights are much rarer, and even a tiny difference in size can significantly increase the price.
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Prioritize cut over carat
While carat weight is important, the cut of a diamond is by far the most significant factor in determining its beauty. Even if it weighs slightly less, a well-cut diamond can appear larger and more brilliant than a poorly cut diamond of the same carat weight.
At VANBRUUN, we focus on the perfect balance of carat, cut, color, and clarity, ensuring that every diamond we offer shines with unmatched brilliance. When selecting a diamond, prioritize the cut, and rest assured that its beauty will far outweigh any emphasis on carat weight alone.