Marquise Cut Diamond Size Chart (MM)

Marquise diamonds vary widely in terms of measurement proportions and carat weight. Use the chart below to obtain the average conversion expectations for a marquise cut diamond.

6x3 mm. 0.25 ct.
8x4 mm. 0.50 ct.
9x4.5 mm. 0.75 ct.
10x5 mm. 1.00 ct.
11x5.5 mm. 1.25 ct.
12x6 mm. 1.50 ct.
12.5x6.25 mm. 1.75 ct.
13x6.5 mm. 2.00 ct.
14x7 mm. 2.50 ct.
15x7 mm. 3.00 ct.
15x8 mm. 3.50 ct.
16.5x8.25 mm. 4.00 ct.
16.75x8.5 mm. 4.50 ct.
17x8.5 mm. 5.00 ct.

Designed for Your Comfort

Round

Princess

Cushion

Oval

Emerald

Heart

Pear

Asscher

Radiant

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?

EthicallySourced

FreeResizing

LifetimeCare

ExpertGuidance

Create Your Ring

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