How big is a 1.75 carat radiant cut diamond?

By HeyGema™ · Updated

In short

A 1.75 carat radiant cut diamond measures about 7.8 x 6.0 mm. It faces up 2% smaller than a round diamond of the same weight. On a size 6 finger it covers 37% of the width. For the same weight, a round diamond is 7.8 mm.

Carat to mm calculator

About 7.8 x 6.0 mm

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

1.75 ct radiant
7.8 x 6.0 mm
1.75 ct round
7.8 mm
Side by side
1.75 ct radiant inside 1.75 ct round
A 1.75 carat radiant diamond beside a 1.75 carat round, to the same scale.

1.75 carat radiant diamond size

A well-cut 1.75 carat radiant cut diamond measures about 7.8 x 6.0 mm (0.31 x 0.24 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 0.35 grams.

1.75 carat radiant size by length-to-width ratio

The same weight can be long and narrow or short and wide. These are 1.75 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: 6.9 x 6.9 mm
Width on the finger: 42% of a size 6 finger
1.15:1
Length x width: 7.4 x 6.4 mm
Width on the finger: 39% of a size 6 finger
1.30:1
Length x width: 7.8 x 6.0 mm
Width on the finger: 37% of a size 6 finger
1.40:1
Length x width: 8.1 x 5.8 mm
Width on the finger: 35% of a size 6 finger

1.75 carat radiant on a finger

6.0 mm
6.0 mm stone on a 16.5 mm finger: it covers 37% of the widthA 1.75 carat radiant diamond on a size 6 finger.
4
Finger width: 14.9 mm
Radiant covers: 40%
5
Finger width: 15.7 mm
Radiant covers: 38%
6
Finger width: 16.5 mm
Radiant covers: 37%
7
Finger width: 17.3 mm
Radiant covers: 35%
8
Finger width: 18.1 mm
Radiant covers: 33%
9
Finger width: 18.9 mm
Radiant covers: 32%

Radiant sizes near 1.75 carat

1.25 carat
Length x width: 7.0 x 5.4 mm
Round of the same weight: 6.9 mm
1.5 carat
Length x width: 7.4 x 5.7 mm
Round of the same weight: 7.4 mm
1.75 (this page)
Length x width: 7.8 x 6.0 mm
Round of the same weight: 7.8 mm
2 carat
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

1.75 carat in other shapes

Every row is a well-cut diamond of 1.75 carat. The last column is the face-up size against the radiant.

Round
Length x width: 7.8 mm
Against radiant: +2%
Oval
Length x width: 9.6 x 6.6 mm
Against radiant: +8%
Cushion
Length x width: 6.7 x 6.7 mm
Against radiant: -12%
Princess
Length x width: 6.6 x 6.6 mm
Against radiant: -6%
Emerald cut
Length x width: 8.4 x 6.0 mm
Against radiant: +6%
Asscher
Length x width: 6.6 x 6.6 mm
Against radiant: -13%
Pear
Length x width: 10.2 x 6.6 mm
Against radiant: same
Marquise
Length x width: 12.5 x 6.3 mm
Against radiant: +19%
Heart
Length x width: 7.8 x 7.8 mm
Against radiant: -15%
Trillion
Length x width: 8.4 x 8.4 mm
Against radiant: -11%
Baguette
Length x width: 9.6 x 4.8 mm
Against radiant: same

Questions

A 1.75 carat radiant cut diamond is about 7.8 x 6.0 mm at the usual 1.30:1 ratio.
No. Face-up, a 1.75 carat radiant is 2% smaller than a 1.75 carat round (7.8 mm).
There is no rule. The stone is 40% of the width of a size 4 finger and 33% 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