How big is a 2.5 carat baguette diamond?

By HeyGema™ · Updated

In short

A 2.5 carat baguette diamond measures about 10.9 x 5.4 mm. It faces up 2% smaller than a round diamond of the same weight. On a size 6 finger it covers 33% of the width. For the same weight, a round diamond is 8.8 mm.

Carat to mm calculator

About 10.9 x 5.4 mm

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

2.5 ct baguette
10.9 x 5.4 mm
2.5 ct round
8.8 mm
Side by side
2.5 ct baguette inside 2.5 ct round
A 2.5 carat baguette diamond beside a 2.5 carat round, to the same scale.

2.5 carat baguette diamond size

A well-cut 2.5 carat baguette diamond measures about 10.9 x 5.4 mm (0.43 x 0.21 inches) at a length-to-width ratio of 2.00:1. It faces up 2% smaller than a round diamond of the same weight. It weighs 0.50 grams.

2.5 carat baguette size by length-to-width ratio

The same weight can be long and narrow or short and wide. These are 2.5 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.

1.50:1
Length x width: 9.4 x 6.3 mm
Width on the finger: 38% of a size 6 finger
2.00:1
Length x width: 10.9 x 5.4 mm
Width on the finger: 33% of a size 6 finger
2.50:1
Length x width: 12.1 x 4.9 mm
Width on the finger: 29% of a size 6 finger
3.00:1
Length x width: 13.3 x 4.4 mm
Width on the finger: 27% of a size 6 finger

2.5 carat baguette on a finger

5.4 mm
5.4 mm stone on a 16.5 mm finger: it covers 33% of the widthA 2.5 carat baguette diamond on a size 6 finger.
4
Finger width: 14.9 mm
Baguette covers: 36%
5
Finger width: 15.7 mm
Baguette covers: 35%
6
Finger width: 16.5 mm
Baguette covers: 33%
7
Finger width: 17.3 mm
Baguette covers: 31%
8
Finger width: 18.1 mm
Baguette covers: 30%
9
Finger width: 18.9 mm
Baguette covers: 29%

Baguette sizes near 2.5 carat

2 carat
Length x width: 10.1 x 5.0 mm
Round of the same weight: 8.1 mm
2.25 carat
Length x width: 10.5 x 5.2 mm
Round of the same weight: 8.5 mm
2.5 (this page)
Length x width: 10.9 x 5.4 mm
Round of the same weight: 8.8 mm
3 carat
Length x width: 11.5 x 5.8 mm
Round of the same weight: 9.3 mm
3.5 carat
Length x width: 12.1 x 6.1 mm
Round of the same weight: 9.8 mm

2.5 carat in other shapes

Every row is a well-cut diamond of 2.5 carat. The last column is the face-up size against the baguette.

Round
Length x width: 8.8 mm
Against baguette: +2%
Oval
Length x width: 10.9 x 7.5 mm
Against baguette: +8%
Cushion
Length x width: 7.6 x 7.6 mm
Against baguette: -12%
Princess
Length x width: 7.5 x 7.5 mm
Against baguette: -6%
Emerald cut
Length x width: 9.5 x 6.8 mm
Against baguette: +6%
Asscher
Length x width: 7.5 x 7.5 mm
Against baguette: -14%
Radiant
Length x width: 8.8 x 6.8 mm
Against baguette: same
Pear
Length x width: 11.5 x 7.5 mm
Against baguette: -1%
Marquise
Length x width: 14.1 x 7.1 mm
Against baguette: +18%
Heart
Length x width: 8.8 x 8.8 mm
Against baguette: -15%
Trillion
Length x width: 9.5 x 9.5 mm
Against baguette: -12%

Questions

A 2.5 carat baguette diamond is about 10.9 x 5.4 mm at the usual 2.00:1 ratio.
No. Face-up, a 2.5 carat baguette is 2% smaller than a 2.5 carat round (8.8 mm).
There is no rule. The stone is 36% of the width of a size 4 finger and 30% 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