Diamond Size Chart Millimeter (MM) to Carat

The measurement of a diamond millimeter will inform you about its actual size. This is because diamond weighing similar carat weight can have different faceting and maybe be larger than the equivalent carat weight. In case you are interested in a diamond that has a larger surface, it is important that you consider getting a diamond that is well cut. Shapes such as pear, emerald and oval are known to have a larger look compared to their round counterparts; overall round cut is still considered to have a large surface size though.

If you are buying a diamond that is already set in an existing setting, measuring the millimeter of the diamond will help you estimate the carat weight of the diamond. However, it may be tricky to get it measured accurately. It is best to seek the advice of a local jeweler in such cases (note: local jewelers are notorious for misleading consumers, so make sure you consult a reliable jeweler).

It is also important to consider millimeter measurements when buying non-round diamond shapes such as emerald and cushion. This is because the measurements of the millimeter will reveal if the diamond rectangular or square, also if it is too shallow or deep (big table or large depth).

There will be more rectangular measurements for emerald cut diamonds, and the square ones are referred to as asscher cuts.

When buying diamonds, the millimeter measurements and carat weight can be found on the grading reports.