How big is a 3 carat diamond?

The size of a 3 carat diamond is about 9.3 millimeters across the widest part of a round diamond. This size can vary a bit due to the type of cut that the stone has.
Chatague, Shopping Expert
How big a three carat diamond is will depend on the cut of the stone. A carat is a measurement of weight and not an actual size. A carat weighs 200 milligrams, therefore a three carat diamond will weigh 600 milligrams. The size of the stone will vary depending on the cut. A round or oval stone will appear bigger than a marquise cut one.
NYCHIK, Shopping Expert
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