How big is a 4 carat iolite?
By HeyGema™ · Updated
In short
A 4 carat round iolite measures about 11.3 mm across (0.45 inches), 10% wider than a 4 carat diamond (10.2 mm). An oval of the same weight is 14.0 x 9.6 mm and an emerald cut 12.3 x 8.8 mm.
- 11.3 mmround iolite, across
- 0.45 inthe same in inches
- 0.80 gweight
- 69%of a size 6 finger's width
Carat to mm calculator
About 11.3 x 11.3 mm
An estimate for a well-cut stone. A deep or shallow cut faces up smaller or bigger.
Round
11.3 mm
Oval
14.0 x 9.6 mm
Cushion
9.8 x 9.8 mm
Princess
9.6 x 9.6 mm
Emerald cut
12.3 x 8.8 mm
Asscher
9.6 x 9.6 mm
Radiant
11.4 x 8.8 mm
Pear
14.9 x 9.6 mm
Marquise
18.2 x 9.1 mm
Heart
11.4 x 11.4 mm
Trillion
12.3 x 12.3 mm
Baguette
14.0 x 7.0 mm
= 5 mm in every picture above
4 carat iolite size by shape
Face-up measurements of a well-cut 4 carat iolite. Iolite is lighter than diamond (2.61 against 3.52), so the same weight gives a bigger stone, 10% wider across.
- Round
- Length x width: 11.3 mm
- In inches: 0.45 in
- Oval
- Length x width: 14.0 x 9.6 mm
- In inches: 0.55 x 0.38 in
- Cushion
- Length x width: 9.8 x 9.8 mm
- In inches: 0.39 x 0.39 in
- Princess
- Length x width: 9.6 x 9.6 mm
- In inches: 0.38 x 0.38 in
- Emerald cut
- Length x width: 12.3 x 8.8 mm
- In inches: 0.48 x 0.35 in
- Asscher
- Length x width: 9.6 x 9.6 mm
- In inches: 0.38 x 0.38 in
- Radiant
- Length x width: 11.4 x 8.8 mm
- In inches: 0.45 x 0.35 in
- Pear
- Length x width: 14.9 x 9.6 mm
- In inches: 0.59 x 0.38 in
- Marquise
- Length x width: 18.2 x 9.1 mm
- In inches: 0.72 x 0.36 in
- Heart
- Length x width: 11.4 x 11.4 mm
- In inches: 0.45 x 0.45 in
- Trillion
- Length x width: 12.3 x 12.3 mm
- In inches: 0.48 x 0.48 in
- Baguette
- Length x width: 14.0 x 7.0 mm
- In inches: 0.55 x 0.28 in
4 carat iolite against other gems
- Diamond
- Round, 4 carat: 10.2 mm
- Moissanite
- Round, 4 carat: 10.5 mm
- Sapphire
- Round, 4 carat: 9.8 mm
- Ruby
- Round, 4 carat: 9.8 mm
- Emerald
- Round, 4 carat: 11.2 mm
- Aquamarine
- Round, 4 carat: 11.2 mm
- Morganite
- Round, 4 carat: 11.1 mm
- Tanzanite
- Round, 4 carat: 10.4 mm
- Iolite (this page)
- Round, 4 carat: 11.3 mm
4 carat iolite on a finger
- 4
- Finger width: 14.9 mm
- Round covers: 76%
- Oval covers: 65%
- 5
- Finger width: 15.7 mm
- Round covers: 72%
- Oval covers: 61%
- 6
- Finger width: 16.5 mm
- Round covers: 69%
- Oval covers: 58%
- 7
- Finger width: 17.3 mm
- Round covers: 65%
- Oval covers: 56%
- 8
- Finger width: 18.1 mm
- Round covers: 62%
- Oval covers: 53%
- 9
- Finger width: 18.9 mm
- Round covers: 60%
- Oval covers: 51%
Iolite at nearby weights
- 3 carat iolite
- Round diameter: 10.3 mm
- 4 ct (this page)
- Round diameter: 11.3 mm
- 5 carat iolite
- Round diameter: 12.2 mm
Questions
A round 4 carat iolite is about 11.3 mm across. Other shapes are longer than they are wide: an oval is 14.0 x 9.6 mm.
Yes. A round 4 carat iolite is 10% wider than a 4 carat diamond (10.2 mm).
0.80 grams. A carat is 200 milligrams for every gem.
A round 4 carat iolite covers 69% of the width of a size 6 finger. Compare it with a ring you have tried on in the finger chart above.