How big is a 2 carat radiant cut diamond?

By HeyGema™ · Updated

In short

A 2 carat radiant cut diamond measures about 8.2 x 6.3 mm. It faces up 2% smaller than a round diamond of the same weight. On a size 6 finger it covers 38% of the width. For the same weight, a round diamond is 8.1 mm.

Carat to mm calculator

About 8.2 x 6.3 mm

An estimate for a well-cut stone. A deep or shallow cut faces up smaller or bigger.

2 ct radiant
8.2 x 6.3 mm
2 ct round
8.1 mm
Side by side
2 ct radiant inside 2 ct round
A 2 carat radiant diamond beside a 2 carat round, to the same scale.

2 carat radiant diamond size

A well-cut 2 carat radiant cut diamond measures about 8.2 x 6.3 mm (0.32 x 0.25 inches) at a length-to-width ratio of 1.30:1. It faces up 2% smaller than a round diamond of the same weight. It weighs 0.40 grams.

2 carat radiant size by length-to-width ratio

The same weight can be long and narrow or short and wide. These are 2 carat sizes at each ratio. A longer ratio runs the stone along the finger and makes it look slimmer. The face-up area stays almost the same.

1.00:1
Length x width: 7.2 x 7.2 mm
Width on the finger: 44% of a size 6 finger
1.15:1
Length x width: 7.7 x 6.7 mm
Width on the finger: 41% of a size 6 finger
1.30:1
Length x width: 8.2 x 6.3 mm
Width on the finger: 38% of a size 6 finger
1.40:1
Length x width: 8.5 x 6.1 mm
Width on the finger: 37% of a size 6 finger

2 carat radiant on a finger

6.3 mm
6.3 mm stone on a 16.5 mm finger: it covers 38% of the widthA 2 carat radiant diamond on a size 6 finger.
4
Finger width: 14.9 mm
Radiant covers: 42%
5
Finger width: 15.7 mm
Radiant covers: 40%
6
Finger width: 16.5 mm
Radiant covers: 38%
7
Finger width: 17.3 mm
Radiant covers: 36%
8
Finger width: 18.1 mm
Radiant covers: 35%
9
Finger width: 18.9 mm
Radiant covers: 33%

Radiant sizes near 2 carat

1.5 carat
Length x width: 7.4 x 5.7 mm
Round of the same weight: 7.4 mm
1.75 carat
Length x width: 7.8 x 6.0 mm
Round of the same weight: 7.8 mm
2 (this page)
Length x width: 8.2 x 6.3 mm
Round of the same weight: 8.1 mm
2.25 carat
Length x width: 8.5 x 6.6 mm
Round of the same weight: 8.5 mm
2.5 carat
Length x width: 8.8 x 6.8 mm
Round of the same weight: 8.8 mm

2 carat in other shapes

Every row is a well-cut diamond of 2 carat. The last column is the face-up size against the radiant.

Round
Length x width: 8.1 mm
Against radiant: +2%
Oval
Length x width: 10.1 x 6.9 mm
Against radiant: +8%
Cushion
Length x width: 7.1 x 7.1 mm
Against radiant: -12%
Princess
Length x width: 6.9 x 6.9 mm
Against radiant: -6%
Emerald cut
Length x width: 8.8 x 6.3 mm
Against radiant: +6%
Asscher
Length x width: 6.9 x 6.9 mm
Against radiant: -13%
Pear
Length x width: 10.7 x 6.9 mm
Against radiant: same
Marquise
Length x width: 13.1 x 6.6 mm
Against radiant: +19%
Heart
Length x width: 8.2 x 8.2 mm
Against radiant: -15%
Trillion
Length x width: 8.8 x 8.8 mm
Against radiant: -11%
Baguette
Length x width: 10.1 x 5.0 mm
Against radiant: same

Questions

A 2 carat radiant cut diamond is about 8.2 x 6.3 mm at the usual 1.30:1 ratio.
No. Face-up, a 2 carat radiant is 2% smaller than a 2 carat round (8.1 mm).
There is no rule. The stone is 42% of the width of a size 4 finger and 35% of a size 8. Compare it with a ring you have tried on in the finger chart above.
Yes. A lab grown diamond has the same density as a mined one, so it measures the same for the same weight.

More size charts