Heart Cut Diamond Size Chart (MM)

The ideal cut for a Heart shaped diamond is a square ratio of 1:1 for length and width. The chart below will help you convert the millimeter and carat weights for a heart cut diamond.

4 mm. 0.25 ct.
5 mm. 0.50 ct.
6 mm. 0.75 ct.
6.5 mm. 1.00 ct.
7 mm. 1.25 ct.
7.5 mm. 1.50 ct.
7.7 mm. 1.75 ct.
8 mm. 2.00 ct.
8.5 mm. 2.50 ct.
9 mm. 3.00 ct.
10 mm. 3.50 ct.
10.5 mm. 4.00 ct.
11 mm. 4.50 ct.
11.5 mm. 5.00 ct.

Designed for Your Comfort










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?





Create Your Ring

Create your unique diamond engagement ring that reflects your Personal style while staying on budget.