Converting Millimeters to Carat Weight

Gauge Used to Measure Diamond Dimensions

Making Sense Of It All

We often get questions from jewelers, wholesalers and our private customers about converting the millimeters of a diamond to the carat weight and vice versa. We have therefore put together a simple millimeter to carat weight conversion chart for the most popular diamond shapes. As well as helping you choose the center stone for a piece of jewelry, this chart can also help you select the ideal sized side stones for a center stone diamond in a diamond engagement ring or diamond pendant.

We can also customize items of jewelry for customers, arranging layouts to help match side stones to each other as well as match side stones to the center stone. Please note that these conversions are estimates, based on our own extensive research.

You can find the diamond converter table for the diamond shape you are looking for by clicking on the relevant link below:

Diamond Converter Tables By Diamond Shape


If you have any questions about diamond jewelry, we can always be contacted on 1-800-557-7095 where one of our expert diamond jewelers will be happy to assist you. Or you can email us at [email protected] with any questions you may have.