How big is a 5 carat opal?
By HeyGema™ · Updated
In short
A 5 carat round opal measures about 13.1 mm across (0.52 inches), 19% wider than a 5 carat diamond (11.0 mm). An oval of the same weight is 16.3 x 11.2 mm and an emerald cut 14.2 x 10.2 mm.
- 13.1 mmround opal, across
- 0.52 inthe same in inches
- 1.00 gweight
- 79%of a size 6 finger's width
Carat to mm calculator
About 13.1 x 13.1 mm
An estimate for a well-cut stone. A deep or shallow cut faces up smaller or bigger.
Round
13.1 mm
Oval
16.3 x 11.2 mm
Cushion
11.4 x 11.4 mm
Princess
11.2 x 11.2 mm
Emerald cut
14.2 x 10.2 mm
Asscher
11.2 x 11.2 mm
Radiant
13.2 x 10.2 mm
Pear
17.3 x 11.2 mm
Marquise
21.1 x 10.6 mm
Heart
13.2 x 13.2 mm
Trillion
14.2 x 14.2 mm
Baguette
16.3 x 8.1 mm
= 5 mm in every picture above
5 carat opal size by shape
Face-up measurements of a well-cut 5 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: 13.1 mm
- In inches: 0.52 in
- Oval
- Length x width: 16.3 x 11.2 mm
- In inches: 0.64 x 0.44 in
- Cushion
- Length x width: 11.4 x 11.4 mm
- In inches: 0.45 x 0.45 in
- Princess
- Length x width: 11.2 x 11.2 mm
- In inches: 0.44 x 0.44 in
- Emerald cut
- Length x width: 14.2 x 10.2 mm
- In inches: 0.56 x 0.40 in
- Asscher
- Length x width: 11.2 x 11.2 mm
- In inches: 0.44 x 0.44 in
- Radiant
- Length x width: 13.2 x 10.2 mm
- In inches: 0.52 x 0.40 in
- Pear
- Length x width: 17.3 x 11.2 mm
- In inches: 0.68 x 0.44 in
- Marquise
- Length x width: 21.1 x 10.6 mm
- In inches: 0.83 x 0.42 in
- Heart
- Length x width: 13.2 x 13.2 mm
- In inches: 0.52 x 0.52 in
- Trillion
- Length x width: 14.2 x 14.2 mm
- In inches: 0.56 x 0.56 in
- Baguette
- Length x width: 16.3 x 8.1 mm
- In inches: 0.64 x 0.32 in
5 carat opal against other gems
- Diamond
- Round, 5 carat: 11.0 mm
- Moissanite
- Round, 5 carat: 11.4 mm
- Sapphire
- Round, 5 carat: 10.6 mm
- Ruby
- Round, 5 carat: 10.6 mm
- Emerald
- Round, 5 carat: 12.0 mm
- Aquamarine
- Round, 5 carat: 12.0 mm
- Morganite
- Round, 5 carat: 11.9 mm
- Tanzanite
- Round, 5 carat: 11.2 mm
- Opal (this page)
- Round, 5 carat: 13.1 mm
5 carat opal on a finger
- 4
- Finger width: 14.9 mm
- Round covers: 88%
- Oval covers: 75%
- 5
- Finger width: 15.7 mm
- Round covers: 83%
- Oval covers: 71%
- 6
- Finger width: 16.5 mm
- Round covers: 79%
- Oval covers: 68%
- 7
- Finger width: 17.3 mm
- Round covers: 76%
- Oval covers: 65%
- 8
- Finger width: 18.1 mm
- Round covers: 72%
- Oval covers: 62%
- 9
- Finger width: 18.9 mm
- Round covers: 69%
- Oval covers: 59%
Opal at nearby weights
- 4 carat opal
- Round diameter: 12.2 mm
- 5 ct (this page)
- Round diameter: 13.1 mm
- 10 carat opal
- Round diameter: 16.5 mm
Questions
A round 5 carat opal is about 13.1 mm across. Other shapes are longer than they are wide: an oval is 16.3 x 11.2 mm.
Yes. A round 5 carat opal is 19% wider than a 5 carat diamond (11.0 mm).
1.00 grams. A carat is 200 milligrams for every gem.
A round 5 carat opal covers 79% of the width of a size 6 finger. Compare it with a ring you have tried on in the finger chart above.