4 carat vs 5 carat diamond size
By HeyGema™ · Updated
In short
A round 5 carat diamond measures 11.0 mm and a round 4 carat 10.2 mm. The 5 carat is 1.25 times the weight but only 8% wider (0.8 mm), with 16% more face-up area.
- 10.2 vs 11.0 mmround diameter
- 8%wider at 5 ct
- 16%more face-up area
Carat to mm calculator
About 11.0 x 11.0 mm
An estimate for a well-cut stone. A deep or shallow cut faces up smaller or bigger.
4 carat vs 5 carat: how much bigger is it?
A 5 carat diamond weighs 1.25 times the weight of a 4 carat, but it is only 8% wider. A round 4 carat measures 10.2 mm and a round 5 carat 11.0 mm, a difference of 0.8 mm. Seen from above, the 5 carat covers 16% more area.
The gap is smaller than the weights suggest because carats measure weight, which grows with volume. A stone that is twice as heavy is the cube root of two (1.26 times) as wide, not twice as wide.
4 carat and 5 carat in every shape
- Round
- 4 carat: 10.2 mm
- 5 carat: 11.0 mm
- Longer by: 0.8 mm
- Oval
- 4 carat: 12.7 x 8.7 mm
- 5 carat: 13.7 x 9.4 mm
- Longer by: 1.0 mm
- Cushion
- 4 carat: 8.9 x 8.9 mm
- 5 carat: 9.6 x 9.6 mm
- Longer by: 0.7 mm
- Princess
- 4 carat: 8.7 x 8.7 mm
- 5 carat: 9.4 x 9.4 mm
- Longer by: 0.7 mm
- Emerald cut
- 4 carat: 11.1 x 7.9 mm
- 5 carat: 12.0 x 8.5 mm
- Longer by: 0.9 mm
- Pear
- 4 carat: 13.5 x 8.7 mm
- 5 carat: 14.5 x 9.4 mm
- Longer by: 1.0 mm
- Marquise
- 4 carat: 16.5 x 8.3 mm
- 5 carat: 17.8 x 8.9 mm
- Longer by: 1.3 mm
- Radiant
- 4 carat: 10.3 x 7.9 mm
- 5 carat: 11.1 x 8.5 mm
- Longer by: 0.8 mm
- Asscher
- 4 carat: 8.7 x 8.7 mm
- 5 carat: 9.4 x 9.4 mm
- Longer by: 0.7 mm
- Heart
- 4 carat: 10.3 x 10.3 mm
- 5 carat: 11.1 x 11.1 mm
- Longer by: 0.8 mm
4 carat vs 5 carat on a finger
- 4
- Finger width: 14.9 mm
- Round 4 ct covers: 69%
- Round 5 ct covers: 74%
- 5
- Finger width: 15.7 mm
- Round 4 ct covers: 65%
- Round 5 ct covers: 70%
- 6
- Finger width: 16.5 mm
- Round 4 ct covers: 62%
- Round 5 ct covers: 67%
- 7
- Finger width: 17.3 mm
- Round 4 ct covers: 59%
- Round 5 ct covers: 64%
- 8
- Finger width: 18.1 mm
- Round 4 ct covers: 56%
- Round 5 ct covers: 61%
On a size 6 finger the 4 carat reads as statement (62% of the width) and the 5 carat as statement (67%). The bands are our own: delicate is under 30% of the finger's width, classic is 30% to 44%, bold is 45% to 59%, statement is 60% and more.
Other cuts at 4 and 5 carat
Shape changes the picture. An oval or a pear of 4 carat can face up as large as a round of a higher weight. See the shapes that look biggest, or compare any two stones with the size comparison tool.