Carat Weight

What does diamond carat weight mean?

Before grams and ounces, diamonds were weighed using carobs, a long green bean with seeds inside. The beans were nearly identical in size, making them ideal for Mediterranean traders to use when weighing gemstones. One seed equalled one carob, which is likely where the term carat originates.

Carat is often confused with the size of a diamond even though it’s actually a unit that measures its weight. Today, one carat is equal to 0.2 grams.


Because larger diamonds are more rare, the heavier the diamond, the higher the price. Though price increases aren’t steady—they increase exponentially with carat weight. For example, a 1ct diamond would be valued higher than two 0.50ct diamonds of the same quality. In general, a diamond of double the weight can cost three to four times more.

Does bigger mean better when it comes to diamonds?

Just because a diamond is bigger, doesn’t mean it’s better. The right diamond isn’t just based on one factor but a combination of all 4 Cs (carat, cut, clarity and colour). When choosing a diamond, focus on the quality that’s most important to you, then work to balance the remaining three.

Taylor & Hart can source diamonds with carat weights from 0.30ct and above. You can see how different diamond carat weights compare here.

Our consultants are available to help you to better understand the importance of carat weight in a diamond and how you can find a size and weight that fits within your price point for your diamond engagement ring.

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