How big is a 10 carat ruby?
By HeyGema™ · Updated
In short
A 10 carat round ruby measures about 13.3 mm across (0.52 inches), 4% narrower than a 10 carat diamond (13.9 mm). An oval of the same weight is 16.5 x 11.4 mm and an emerald cut 14.5 x 10.3 mm.
- 13.3 mmround ruby, across
- 0.52 inthe same in inches
- 2.00 gweight
- 81%of a size 6 finger's width
Carat to mm calculator
About 13.3 x 13.3 mm
An estimate for a well-cut stone. A deep or shallow cut faces up smaller or bigger.
Round
13.3 mm
Oval
16.5 x 11.4 mm
Cushion
11.6 x 11.6 mm
Princess
11.4 x 11.4 mm
Emerald cut
14.5 x 10.3 mm
Asscher
11.4 x 11.4 mm
Radiant
13.4 x 10.3 mm
Pear
17.5 x 11.4 mm
Marquise
21.5 x 10.7 mm
Heart
13.4 x 13.4 mm
Trillion
14.5 x 14.5 mm
Baguette
16.5 x 8.3 mm
= 5 mm in every picture above
10 carat ruby size by shape
Face-up measurements of a well-cut 10 carat ruby. Ruby is denser than diamond (4.00 against 3.52), so it packs more weight into less space and faces up 4% narrower for the same weight.
- Round
- Length x width: 13.3 mm
- In inches: 0.52 in
- Oval
- Length x width: 16.5 x 11.4 mm
- In inches: 0.65 x 0.45 in
- Cushion
- Length x width: 11.6 x 11.6 mm
- In inches: 0.46 x 0.46 in
- Princess
- Length x width: 11.4 x 11.4 mm
- In inches: 0.45 x 0.45 in
- Emerald cut
- Length x width: 14.5 x 10.3 mm
- In inches: 0.57 x 0.41 in
- Asscher
- Length x width: 11.4 x 11.4 mm
- In inches: 0.45 x 0.45 in
- Radiant
- Length x width: 13.4 x 10.3 mm
- In inches: 0.53 x 0.41 in
- Pear
- Length x width: 17.5 x 11.4 mm
- In inches: 0.69 x 0.45 in
- Marquise
- Length x width: 21.5 x 10.7 mm
- In inches: 0.85 x 0.42 in
- Heart
- Length x width: 13.4 x 13.4 mm
- In inches: 0.53 x 0.53 in
- Trillion
- Length x width: 14.5 x 14.5 mm
- In inches: 0.57 x 0.57 in
- Baguette
- Length x width: 16.5 x 8.3 mm
- In inches: 0.65 x 0.33 in
10 carat ruby against other gems
- Diamond
- Round, 10 carat: 13.9 mm
- Moissanite
- Round, 10 carat: 14.3 mm
- Sapphire
- Round, 10 carat: 13.3 mm
- Emerald
- Round, 10 carat: 15.1 mm
- Aquamarine
- Round, 10 carat: 15.2 mm
- Morganite
- Round, 10 carat: 15.0 mm
- Tanzanite
- Round, 10 carat: 14.1 mm
- Topaz
- Round, 10 carat: 13.9 mm
- Ruby (this page)
- Round, 10 carat: 13.3 mm
10 carat ruby on a finger
- 4
- Finger width: 14.9 mm
- Round covers: 89%
- Oval covers: 76%
- 5
- Finger width: 15.7 mm
- Round covers: 85%
- Oval covers: 72%
- 6
- Finger width: 16.5 mm
- Round covers: 81%
- Oval covers: 69%
- 7
- Finger width: 17.3 mm
- Round covers: 77%
- Oval covers: 66%
- 8
- Finger width: 18.1 mm
- Round covers: 73%
- Oval covers: 63%
- 9
- Finger width: 18.9 mm
- Round covers: 70%
- Oval covers: 60%
Ruby at nearby weights
- 5 carat ruby
- Round diameter: 10.6 mm
- 10 ct (this page)
- Round diameter: 13.3 mm
Questions
A round 10 carat ruby is about 13.3 mm across. Other shapes are longer than they are wide: an oval is 16.5 x 11.4 mm.
No. A round 10 carat ruby is 4% narrower than a 10 carat diamond (13.9 mm).
2.00 grams. A carat is 200 milligrams for every gem.
A round 10 carat ruby covers 81% of the width of a size 6 finger. Compare it with a ring you have tried on in the finger chart above.