Diamond Weight vs. Size

Posted on Wednesday, November 13th, 2019 in Diamond, Informational.


While a diamond’s cut, color, and clarity are all important characteristics to consider when purchasing a diamond, many individuals pay particularly close attention to the diamond’s size. Typically, the larger the diamond, the more valuable it will be and the more sparkle it will have.

A diamond’s carat weight is often referenced when gauging a diamond’s size, but it’s important to keep in mind that carat weight is not the same thing as diamond size. Like its name implies, carat weight refers to the weight of a particular gemstone. A diamond’s weight is expressed in carats, with one carat equaling 0.2 grams. A diamond’s size, on the other hand, typically represents the diameter of the top of the diamond and is often expressed in millimeters.

So doesn’t it make sense that the heavier the diamond, the larger diameter it will have? Not necessarily. A diamond’s cut can greatly affect its perceived size. If a diamond is cut too deep or has a girdle that’s too thick, more weight will be added to the bottom portion of the diamond without affecting the diameter of the diamond. So a poorly-cut one carat diamond may actually look like a .80 carat properly-cut diamond, meaning  you’re paying for a one carat diamond but aren’t getting the benefit of a one carat diamond’s size.

That’s why it’s so important to work with an experienced diamond buying expert when looking to purchase a diamond. They’ll know how to analyze a diamond’s cut to ensure that you’re getting the most value for your dollar.


If you’re interested in purchasing a diamond, contact Kloiber Jewelers at 414-276-2457 or info@kloiberjewelers.com.