How big is a 2 carat opal?
By HeyGema™ · Updated
In short
A 2 carat round opal measures about 9.7 mm across (0.38 inches), 19% wider than a 2 carat diamond (8.1 mm). An oval of the same weight is 12.0 x 8.2 mm and an emerald cut 10.5 x 7.5 mm.
- 9.7 mmround opal, across
- 0.38 inthe same in inches
- 0.40 gweight
- 58%of a size 6 finger's width
Carat to mm calculator
About 9.7 x 9.7 mm
An estimate for a well-cut stone. A deep or shallow cut faces up smaller or bigger.
Round
9.7 mm
Oval
12.0 x 8.2 mm
Cushion
8.4 x 8.4 mm
Princess
8.2 x 8.2 mm
Emerald cut
10.5 x 7.5 mm
Asscher
8.2 x 8.2 mm
Radiant
9.7 x 7.5 mm
Pear
12.7 x 8.2 mm
Marquise
15.6 x 7.8 mm
Heart
9.7 x 9.7 mm
Trillion
10.5 x 10.5 mm
Baguette
12.0 x 6.0 mm
= 5 mm in every picture above
2 carat opal size by shape
Face-up measurements of a well-cut 2 carat opal. Opal is lighter than diamond (2.10 against 3.52), so the same weight gives a bigger stone, 19% wider across.
- Round
- Length x width: 9.7 mm
- In inches: 0.38 in
- Oval
- Length x width: 12.0 x 8.2 mm
- In inches: 0.47 x 0.32 in
- Cushion
- Length x width: 8.4 x 8.4 mm
- In inches: 0.33 x 0.33 in
- Princess
- Length x width: 8.2 x 8.2 mm
- In inches: 0.32 x 0.32 in
- Emerald cut
- Length x width: 10.5 x 7.5 mm
- In inches: 0.41 x 0.29 in
- Asscher
- Length x width: 8.2 x 8.2 mm
- In inches: 0.32 x 0.32 in
- Radiant
- Length x width: 9.7 x 7.5 mm
- In inches: 0.38 x 0.29 in
- Pear
- Length x width: 12.7 x 8.2 mm
- In inches: 0.50 x 0.32 in
- Marquise
- Length x width: 15.6 x 7.8 mm
- In inches: 0.61 x 0.31 in
- Heart
- Length x width: 9.7 x 9.7 mm
- In inches: 0.38 x 0.38 in
- Trillion
- Length x width: 10.5 x 10.5 mm
- In inches: 0.41 x 0.41 in
- Baguette
- Length x width: 12.0 x 6.0 mm
- In inches: 0.47 x 0.24 in
2 carat opal against other gems
- Diamond
- Round, 2 carat: 8.1 mm
- Moissanite
- Round, 2 carat: 8.4 mm
- Sapphire
- Round, 2 carat: 7.8 mm
- Ruby
- Round, 2 carat: 7.8 mm
- Emerald
- Round, 2 carat: 8.9 mm
- Aquamarine
- Round, 2 carat: 8.9 mm
- Morganite
- Round, 2 carat: 8.8 mm
- Tanzanite
- Round, 2 carat: 8.3 mm
- Opal (this page)
- Round, 2 carat: 9.7 mm
2 carat opal on a finger
- 4
- Finger width: 14.9 mm
- Round covers: 65%
- Oval covers: 55%
- 5
- Finger width: 15.7 mm
- Round covers: 62%
- Oval covers: 52%
- 6
- Finger width: 16.5 mm
- Round covers: 58%
- Oval covers: 50%
- 7
- Finger width: 17.3 mm
- Round covers: 56%
- Oval covers: 48%
- 8
- Finger width: 18.1 mm
- Round covers: 53%
- Oval covers: 45%
- 9
- Finger width: 18.9 mm
- Round covers: 51%
- Oval covers: 43%
Opal at nearby weights
- 1.5 carat opal
- Round diameter: 8.8 mm
- 2 ct (this page)
- Round diameter: 9.7 mm
- 3 carat opal
- Round diameter: 11.1 mm
Questions
A round 2 carat opal is about 9.7 mm across. Other shapes are longer than they are wide: an oval is 12.0 x 8.2 mm.
Yes. A round 2 carat opal is 19% wider than a 2 carat diamond (8.1 mm).
0.40 grams. A carat is 200 milligrams for every gem.
A round 2 carat opal covers 58% of the width of a size 6 finger. Compare it with a ring you have tried on in the finger chart above.