Guides
One carat is 0.2 grams. Spread — how large the diamond looks — depends on shape and cut as well as weight.
A well-cut round is about 5.1 mm at 0.50 ct, 6.4 mm at 1.00 ct, 8.1 mm at 2.00 ct, and 9.3 mm at 3.00 ct. Those are face-up diameters, not a promise for every stone. A deep cut weighs the same and looks smaller.
Prices step up around round weights (1.00, 1.50, 2.00) because shoppers search those numbers. A 0.90 ct diamond can look almost the same as a 1.00 ct and cost less. The same pattern shows up just under 2.00 ct.
Elongated shapes (oval, pear, marquise) cover more of the finger at the same carat. If the goal is a bigger look, shape can do more than another tenth of a carat.
Carat Mate lists certified loose diamonds for shoppers in the United States, Canada, the UAE, London, and Australia. Prices are in USD everywhere. We ship to the United States, Canada, the UAE, London, and Australia.
