Diamond Size Chart

Want to know the actual size of a 1 carat diamond on a hand? Use our diamond size chart to understand the millimeter (mm) size of each diamond shape.

4 mm. 0.25 ct.
5.0 mm. 0.50 ct.
5.75 mm. 0.75 ct.
6.5 mm. 1.00 ct.
6.8 mm. 1.25 ct.
7.3 mm. 1.50 ct.
7.75 mm. 1.75 ct.
8 mm. 2.00 ct.
8.7 mm. 2.50 ct.
9.1 mm. 3.00 ct.
9.75 mm. 3.50 ct.
10.25 mm. 4.00 ct.
10.75 mm. 4.50 ct.
11 mm. 5.00 ct.

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diamond size hand oval.


diamond size hand emerald








Diamond Education

Learn about diamonds and discover the 4C’s, diamond grading, and certifications to help you pick the perfect diamond.

Diamond Size FAQs

How is diamond size measured?

Is carat the only factor that affects the size appearance of a diamond?

Does the shape of a diamond influence how big it looks?

Can the setting make a diamond look bigger?

What's the difference between "carat weight" and "total carat weight"?

How does diamond size affect price?

Can two diamonds of the same carat weight appear different in size?

Is it better to get a slightly smaller diamond with higher quality or a bigger diamond with lower quality?

How can I accurately gauge the size of a diamond when shopping online?

Are there ethical considerations to keep in mind when choosing a diamond size?