How big is a carat diamond?

A one carat diamond is equal to the size of pea and is often very beautiful when put it a setting. It's size in millimeters is roughly six point five.
lacharron, Shopping Expert
A single carat diamond is about 6.5 millimeters across its widest point. This is generally true for a round cut diamond. Different diamond shapes will change this a bit.
Chatague, Shopping Expert
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