How big is a 3 carat cubic zirconia?
By HeyGema™ · Updated
In short
A 3 carat round cubic zirconia measures about 7.9 mm across (0.31 inches), 15% narrower than a 3 carat diamond (9.3 mm). An oval of the same weight is 9.8 x 6.7 mm and an emerald cut 8.5 x 6.1 mm.
- 7.9 mmround cubic zirconia, across
- 0.31 inthe same in inches
- 0.60 gweight
- 48%of a size 6 finger's width
Carat to mm calculator
About 7.9 x 7.9 mm
An estimate for a well-cut stone. A deep or shallow cut faces up smaller or bigger.
Round
7.9 mm
Oval
9.8 x 6.7 mm
Cushion
6.8 x 6.8 mm
Princess
6.7 x 6.7 mm
Emerald cut
8.5 x 6.1 mm
Asscher
6.7 x 6.7 mm
Radiant
7.9 x 6.1 mm
Pear
10.4 x 6.7 mm
Marquise
12.7 x 6.3 mm
Heart
7.9 x 7.9 mm
Trillion
8.5 x 8.5 mm
Baguette
9.8 x 4.9 mm
= 5 mm in every picture above
3 carat cubic zirconia size by shape
Face-up measurements of a well-cut 3 carat cubic zirconia. Cubic zirconia is denser than diamond (5.80 against 3.52), so it packs more weight into less space and faces up 15% narrower for the same weight.
- Round
- Length x width: 7.9 mm
- In inches: 0.31 in
- Oval
- Length x width: 9.8 x 6.7 mm
- In inches: 0.38 x 0.26 in
- Cushion
- Length x width: 6.8 x 6.8 mm
- In inches: 0.27 x 0.27 in
- Princess
- Length x width: 6.7 x 6.7 mm
- In inches: 0.26 x 0.26 in
- Emerald cut
- Length x width: 8.5 x 6.1 mm
- In inches: 0.34 x 0.24 in
- Asscher
- Length x width: 6.7 x 6.7 mm
- In inches: 0.26 x 0.26 in
- Radiant
- Length x width: 7.9 x 6.1 mm
- In inches: 0.31 x 0.24 in
- Pear
- Length x width: 10.4 x 6.7 mm
- In inches: 0.41 x 0.26 in
- Marquise
- Length x width: 12.7 x 6.3 mm
- In inches: 0.50 x 0.25 in
- Heart
- Length x width: 7.9 x 7.9 mm
- In inches: 0.31 x 0.31 in
- Trillion
- Length x width: 8.5 x 8.5 mm
- In inches: 0.34 x 0.34 in
- Baguette
- Length x width: 9.8 x 4.9 mm
- In inches: 0.38 x 0.19 in
3 carat cubic zirconia against other gems
- Diamond
- Round, 3 carat: 9.3 mm
- Moissanite
- Round, 3 carat: 9.6 mm
- Sapphire
- Round, 3 carat: 8.9 mm
- Ruby
- Round, 3 carat: 8.9 mm
- Emerald
- Round, 3 carat: 10.1 mm
- Aquamarine
- Round, 3 carat: 10.2 mm
- Morganite
- Round, 3 carat: 10.0 mm
- Tanzanite
- Round, 3 carat: 9.5 mm
- Cubic zirconia (this page)
- Round, 3 carat: 7.9 mm
3 carat cubic zirconia on a finger
- 4
- Finger width: 14.9 mm
- Round covers: 53%
- Oval covers: 45%
- 5
- Finger width: 15.7 mm
- Round covers: 50%
- Oval covers: 43%
- 6
- Finger width: 16.5 mm
- Round covers: 48%
- Oval covers: 41%
- 7
- Finger width: 17.3 mm
- Round covers: 45%
- Oval covers: 39%
- 8
- Finger width: 18.1 mm
- Round covers: 43%
- Oval covers: 37%
- 9
- Finger width: 18.9 mm
- Round covers: 42%
- Oval covers: 35%
Cubic zirconia at nearby weights
- 2 carat cubic zirconia
- Round diameter: 6.9 mm
- 3 ct (this page)
- Round diameter: 7.9 mm
- 4 carat cubic zirconia
- Round diameter: 8.7 mm
Questions
A round 3 carat cubic zirconia is about 7.9 mm across. Other shapes are longer than they are wide: an oval is 9.8 x 6.7 mm.
No. A round 3 carat cubic zirconia is 15% narrower than a 3 carat diamond (9.3 mm).
0.60 grams. A carat is 200 milligrams for every gem.
A round 3 carat cubic zirconia covers 48% of the width of a size 6 finger. Compare it with a ring you have tried on in the finger chart above.