How big is a 1 carat moissanite?
By HeyGema™ · Updated
In short
A 1 carat round moissanite measures about 6.6 mm across (0.26 inches), 3% wider than a 1 carat diamond (6.5 mm). An oval of the same weight is 8.2 x 5.7 mm and an emerald cut 7.2 x 5.2 mm.
- 6.6 mmround moissanite, across
- 0.26 inthe same in inches
- 0.20 gweight
- 40%of a size 6 finger's width
Carat to mm calculator
About 6.6 x 6.6 mm
An estimate for a well-cut stone. A deep or shallow cut faces up smaller or bigger.
Round
6.6 mm
Oval
8.2 x 5.7 mm
Cushion
5.8 x 5.8 mm
Princess
5.7 x 5.7 mm
Emerald cut
7.2 x 5.2 mm
Asscher
5.7 x 5.7 mm
Radiant
6.7 x 5.2 mm
Pear
8.8 x 5.7 mm
Marquise
10.7 x 5.4 mm
Heart
6.7 x 6.7 mm
Trillion
7.2 x 7.2 mm
Baguette
8.2 x 4.1 mm
= 2 mm in every picture above
1 carat moissanite size by shape
Face-up measurements of a well-cut 1 carat moissanite. Moissanite is lighter than diamond (3.22 against 3.52), so the same weight gives a bigger stone, 3% wider across.
- Round
- Length x width: 6.6 mm
- In inches: 0.26 in
- Oval
- Length x width: 8.2 x 5.7 mm
- In inches: 0.32 x 0.22 in
- Cushion
- Length x width: 5.8 x 5.8 mm
- In inches: 0.23 x 0.23 in
- Princess
- Length x width: 5.7 x 5.7 mm
- In inches: 0.22 x 0.22 in
- Emerald cut
- Length x width: 7.2 x 5.2 mm
- In inches: 0.28 x 0.20 in
- Asscher
- Length x width: 5.7 x 5.7 mm
- In inches: 0.22 x 0.22 in
- Radiant
- Length x width: 6.7 x 5.2 mm
- In inches: 0.26 x 0.20 in
- Pear
- Length x width: 8.8 x 5.7 mm
- In inches: 0.34 x 0.22 in
- Marquise
- Length x width: 10.7 x 5.4 mm
- In inches: 0.42 x 0.21 in
- Heart
- Length x width: 6.7 x 6.7 mm
- In inches: 0.26 x 0.26 in
- Trillion
- Length x width: 7.2 x 7.2 mm
- In inches: 0.28 x 0.28 in
- Baguette
- Length x width: 8.2 x 4.1 mm
- In inches: 0.32 x 0.16 in
1 carat moissanite against other gems
- Diamond
- Round, 1 carat: 6.5 mm
- Sapphire
- Round, 1 carat: 6.2 mm
- Ruby
- Round, 1 carat: 6.2 mm
- Emerald
- Round, 1 carat: 7.0 mm
- Aquamarine
- Round, 1 carat: 7.0 mm
- Morganite
- Round, 1 carat: 7.0 mm
- Tanzanite
- Round, 1 carat: 6.6 mm
- Topaz
- Round, 1 carat: 6.4 mm
- Moissanite (this page)
- Round, 1 carat: 6.6 mm
1 carat moissanite on a finger
- 4
- Finger width: 14.9 mm
- Round covers: 45%
- Oval covers: 38%
- 5
- Finger width: 15.7 mm
- Round covers: 42%
- Oval covers: 36%
- 6
- Finger width: 16.5 mm
- Round covers: 40%
- Oval covers: 34%
- 7
- Finger width: 17.3 mm
- Round covers: 38%
- Oval covers: 33%
- 8
- Finger width: 18.1 mm
- Round covers: 37%
- Oval covers: 31%
- 9
- Finger width: 18.9 mm
- Round covers: 35%
- Oval covers: 30%
Moissanite at nearby weights
- 0.5 carat moissanite
- Round diameter: 5.3 mm
- 1 ct (this page)
- Round diameter: 6.6 mm
- 1.5 carat moissanite
- Round diameter: 7.6 mm
Questions
A round 1 carat moissanite is about 6.6 mm across. Other shapes are longer than they are wide: an oval is 8.2 x 5.7 mm.
Yes. A round 1 carat moissanite is 3% wider than a 1 carat diamond (6.5 mm).
0.20 grams. A carat is 200 milligrams for every gem.
A round 1 carat moissanite covers 40% of the width of a size 6 finger. Compare it with a ring you have tried on in the finger chart above.