How big is a 1 carat diamond?

A 1 carat diamond is roughly about 6.5 millimeters in size. This size would be similar to the size of an eraser found in a regular number two lead pencil.
rspellot1, Shopping Expert
A diamond that is one carat actually weighs 200 milligrams. The size of the diamond will vary depending on how the diamond is cut. A one carat diamond can look to be several different sizes and shapes but will always weigh 200 milligrams because a carat is a weight measurement, not a measurement of actual size.
NYCHIK, Shopping Expert
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