How To Find MM To Carat Weight Conversions for Diamonds and Gemstones

Gemstones and Moissanite are popular alternatives to diamond engagement rings, and many customers want to know how to measure the size of a gemstone with that of a diamond. The following guide will help you to know about MM to Carat conversion.

How can you measure the size of a diamond?

Diamonds are measured in a unit known as carats; however, a carat is a measurement of weight instead of the dimension. Therefore carrot weight will not influence the overall size and look of your diamond as the carrot is not equal to the size. The fancy elongated diamond can have longer dimensions and shallower depth, so it can take up more space on your finger compared to classic round diamonds with similar carat weight. The look of a diamond can be affected by poor diamond cutting. Perfectly square and round gems will bear the same diameter from all angles so that they will have only one listed measurement. For instance, 8mm to carat.  All gemstones of different shapes will have their length listed in Millimeters. Emarald mm size will 7x5mm in carats.

7mm is how many carats?

Different types of diamond shapes can have seven mm since the Polish symmetry and cutting off each shape of diamond differs from one another. Following are the shape of diamonds that have 7MM carats.

1. Radiant shaped diamond will have a carat weight of 1.00 CT

2. Oval shaped diamond will have a carat weight of 0.75 CT

3. Round shaped diamonds will have a carat weight of 1.30 CT

4. Emerald-shaped diamond will have a carat weight of 1.00 CT 

5. Heart cut diamond will have a carat weight of 1.25 CT

6. Cushion cut diamond will have a carat weight of 2.00 CT

7. Princess cut diamond will have a carat weight of 2.00 CT

Oval gemstones that are flattering and brilliant are becoming the most sought-after choice among couples since they have the same sparkle as round diamonds; however, they have a more lengthening oblong shape. For instance, the size of 9x7mm in carats will be 2 ct. 

Square diamonds and round diamonds with 2carats will be in the range of 7-8 mm. Fancy-shaped diamonds of 2carats have a dimension of 9x7mm and 8x6mm. As Marquis diamonds are thin and long, their dimension of 2carats carats will be 13×6.5mm.

Gemstone size vs. weight

Different gemstones bear different densities, meaning gyms have a different appearance compared to diamonds with the same carat weight. For example, gemstones such as garnet, sapphires, Ruby, and zircon are denser than diamonds. On the other hand, other popular gems, like emeralds, Topaz, Opal, etc., are less dense than diamonds. Therefore round Ruby of 1.5 CT will be smaller compared to a round diamond having the same carat since rubies are heavier and denser than diamonds. Therefore, comparing gemstones' mm dimension to diamond carat weight is a matter of approximation because of different densities.