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1.0 Carat Radiantvs1.25 Carat Round

DIAMOND SIZE & SHAPE COMPARISON TOOL

~ 6.5 mm

1 carat Radiant diamond

1.0

RADIANT

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17.9 mm

US Dime (17.9mm)

~ 6.8 mm

1.25 carat Round diamond

1.25

ROUND

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Find the Perfect 1 Carat Radiant Diamond

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Find the Perfect 1.25 Carat Round Diamond

Radiant vs Round Comparison Analysis

When comparing a 1 carat Radiant to a 1.25 carat Round, the 1.25 carat Round appears visually larger. It has a face-up surface area that is approximately 10% larger than the 1 carat Radiant.

Detailed Measurements:

The 1 carat radiant diamond measures 6.5mm × 5.1mm, while the 1.25 carat round measures 6.8mm × 6.8mm. On an average finger (size 6.5), this diamond occupies about 40% of the finger width, offering a balanced and elegant look.

Shopping Considerations:

Beyond size, consider that radiant diamonds tend to have different brilliance patterns compared to round cuts. 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.

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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.