Carat Compare Logo

1.0 Carat Roundvs3.0 Carat Round

DIAMOND SIZE & SHAPE COMPARISON TOOL

~ 6.5 mm

1 carat Round diamond

1.0

ROUND

SHOP

17.9 mm

US Dime (17.9mm)

~ 9.4 mm

3 carat Round diamond

3.0

ROUND

SHOP

Click the CHANGE button above to modify the carat size and shape and shop for diamonds below.

Gift

Find the Perfect 1 Carat Round Diamond

Gift

Find the Perfect 3 Carat Round Diamond

Round vs Round Comparison Analysis

When comparing a 1 carat Round to a 3 carat Round, the 3 carat Round appears visually larger. It has a face-up surface area that is approximately 109% larger than the 1 carat Round. You gain approximately 2.9mm in width by choosing the 3 carat Round over the 1 carat version.

Detailed Measurements:

The 1 carat round diamond measures 6.5mm × 6.5mm, while the 3 carat round measures 9.4mm × 9.4mm. The 3 carat round covers approximately 55% of the width of an average finger (size 6.5), creating a substantial, eye-catching presence.

Shopping Considerations:

Use the interactive visual tool above to see these diamonds side-by-side with a US dime for real-world scale reference. The measurements shown are based on well-cut diamonds with standard proportions.

Ready to shop? Browse certified diamonds to compare prices and find your perfect diamond.

Diamond

Diamond FAQ

The 4Cs are how all diamonds get graded: Cut, Color, Clarity, and Carat. Cut is how well it's shaped (this affects sparkle the most). Color goes from D (totally colorless) to Z (yellowish tint), though anything D through J looks white in a ring. Clarity is about tiny flaws inside—most are invisible without a jeweler's loupe, so VS1 or VS2 is plenty. Carat is just weight. Here's the trick: get an Excellent cut first, then aim for G-H color and VS2 clarity, and spend whatever's left on the biggest carat you can afford. Start your diamond search to compare options.