How big is a 3 carat topaz?
By HeyGema™ · Updated
In short
A 3 carat round topaz measures about 9.3 mm across (0.37 inches), about the same width as a diamond of the same weight. An oval of the same weight is 11.5 x 7.9 mm and an emerald cut 10.1 x 7.2 mm.
- 9.3 mmround topaz, across
- 0.37 inthe same in inches
- 0.60 gweight
- 56%of a size 6 finger's width
Carat to mm calculator
About 9.3 x 9.3 mm
An estimate for a well-cut stone. A deep or shallow cut faces up smaller or bigger.
Round
9.3 mm
Oval
11.5 x 7.9 mm
Cushion
8.1 x 8.1 mm
Princess
7.9 x 7.9 mm
Emerald cut
10.1 x 7.2 mm
Asscher
7.9 x 7.9 mm
Radiant
9.4 x 7.2 mm
Pear
12.2 x 7.9 mm
Marquise
15.0 x 7.5 mm
Heart
9.4 x 9.4 mm
Trillion
10.1 x 10.1 mm
Baguette
11.5 x 5.8 mm
= 5 mm in every picture above
3 carat topaz size by shape
Face-up measurements of a well-cut 3 carat topaz. Topaz has about the same density as diamond (3.53 against 3.52), so the same weight gives the same size.
- Round
- Length x width: 9.3 mm
- In inches: 0.37 in
- Oval
- Length x width: 11.5 x 7.9 mm
- In inches: 0.45 x 0.31 in
- Cushion
- Length x width: 8.1 x 8.1 mm
- In inches: 0.32 x 0.32 in
- Princess
- Length x width: 7.9 x 7.9 mm
- In inches: 0.31 x 0.31 in
- Emerald cut
- Length x width: 10.1 x 7.2 mm
- In inches: 0.40 x 0.28 in
- Asscher
- Length x width: 7.9 x 7.9 mm
- In inches: 0.31 x 0.31 in
- Radiant
- Length x width: 9.4 x 7.2 mm
- In inches: 0.37 x 0.28 in
- Pear
- Length x width: 12.2 x 7.9 mm
- In inches: 0.48 x 0.31 in
- Marquise
- Length x width: 15.0 x 7.5 mm
- In inches: 0.59 x 0.29 in
- Heart
- Length x width: 9.4 x 9.4 mm
- In inches: 0.37 x 0.37 in
- Trillion
- Length x width: 10.1 x 10.1 mm
- In inches: 0.40 x 0.40 in
- Baguette
- Length x width: 11.5 x 5.8 mm
- In inches: 0.45 x 0.23 in
3 carat topaz 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
- Topaz (this page)
- Round, 3 carat: 9.3 mm
3 carat topaz on a finger
- 4
- Finger width: 14.9 mm
- Round covers: 62%
- Oval covers: 53%
- 5
- Finger width: 15.7 mm
- Round covers: 59%
- Oval covers: 50%
- 6
- Finger width: 16.5 mm
- Round covers: 56%
- Oval covers: 48%
- 7
- Finger width: 17.3 mm
- Round covers: 54%
- Oval covers: 46%
- 8
- Finger width: 18.1 mm
- Round covers: 51%
- Oval covers: 44%
- 9
- Finger width: 18.9 mm
- Round covers: 49%
- Oval covers: 42%
Topaz at nearby weights
- 2 carat topaz
- Round diameter: 8.1 mm
- 3 ct (this page)
- Round diameter: 9.3 mm
- 4 carat topaz
- Round diameter: 10.2 mm
Questions
A round 3 carat topaz is about 9.3 mm across. Other shapes are longer than they are wide: an oval is 11.5 x 7.9 mm.
About the same. A round 3 carat topaz is about the same width as a diamond of the same weight.
0.60 grams. A carat is 200 milligrams for every gem.
A round 3 carat topaz covers 56% of the width of a size 6 finger. Compare it with a ring you have tried on in the finger chart above.