How big is a 1.5 carat ruby?
By HeyGema™ · Updated
In short
A 1.5 carat round ruby measures about 7.1 mm across (0.28 inches), 4% narrower than a 1.5 carat diamond (7.4 mm). An oval of the same weight is 8.8 x 6.0 mm and an emerald cut 7.7 x 5.5 mm.
- 7.1 mmround ruby, across
- 0.28 inthe same in inches
- 0.30 gweight
- 43%of a size 6 finger's width
Carat to mm calculator
About 7.1 x 7.1 mm
An estimate for a well-cut stone. A deep or shallow cut faces up smaller or bigger.
Round
7.1 mm
Oval
8.8 x 6.0 mm
Cushion
6.1 x 6.1 mm
Princess
6.0 x 6.0 mm
Emerald cut
7.7 x 5.5 mm
Asscher
6.0 x 6.0 mm
Radiant
7.1 x 5.5 mm
Pear
9.3 x 6.0 mm
Marquise
11.4 x 5.7 mm
Heart
7.1 x 7.1 mm
Trillion
7.7 x 7.7 mm
Baguette
8.8 x 4.4 mm
= 2 mm in every picture above
1.5 carat ruby size by shape
Face-up measurements of a well-cut 1.5 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: 7.1 mm
- In inches: 0.28 in
- Oval
- Length x width: 8.8 x 6.0 mm
- In inches: 0.35 x 0.24 in
- Cushion
- Length x width: 6.1 x 6.1 mm
- In inches: 0.24 x 0.24 in
- Princess
- Length x width: 6.0 x 6.0 mm
- In inches: 0.24 x 0.24 in
- Emerald cut
- Length x width: 7.7 x 5.5 mm
- In inches: 0.30 x 0.22 in
- Asscher
- Length x width: 6.0 x 6.0 mm
- In inches: 0.24 x 0.24 in
- Radiant
- Length x width: 7.1 x 5.5 mm
- In inches: 0.28 x 0.22 in
- Pear
- Length x width: 9.3 x 6.0 mm
- In inches: 0.37 x 0.24 in
- Marquise
- Length x width: 11.4 x 5.7 mm
- In inches: 0.45 x 0.22 in
- Heart
- Length x width: 7.1 x 7.1 mm
- In inches: 0.28 x 0.28 in
- Trillion
- Length x width: 7.7 x 7.7 mm
- In inches: 0.30 x 0.30 in
- Baguette
- Length x width: 8.8 x 4.4 mm
- In inches: 0.35 x 0.17 in
1.5 carat ruby against other gems
- Diamond
- Round, 1.5 carat: 7.4 mm
- Moissanite
- Round, 1.5 carat: 7.6 mm
- Sapphire
- Round, 1.5 carat: 7.1 mm
- Emerald
- Round, 1.5 carat: 8.0 mm
- Aquamarine
- Round, 1.5 carat: 8.1 mm
- Morganite
- Round, 1.5 carat: 8.0 mm
- Tanzanite
- Round, 1.5 carat: 7.5 mm
- Topaz
- Round, 1.5 carat: 7.4 mm
- Ruby (this page)
- Round, 1.5 carat: 7.1 mm
1.5 carat ruby on a finger
- 4
- Finger width: 14.9 mm
- Round covers: 48%
- Oval covers: 41%
- 5
- Finger width: 15.7 mm
- Round covers: 45%
- Oval covers: 38%
- 6
- Finger width: 16.5 mm
- Round covers: 43%
- Oval covers: 37%
- 7
- Finger width: 17.3 mm
- Round covers: 41%
- Oval covers: 35%
- 8
- Finger width: 18.1 mm
- Round covers: 39%
- Oval covers: 33%
- 9
- Finger width: 18.9 mm
- Round covers: 37%
- Oval covers: 32%
Ruby at nearby weights
- 1 carat ruby
- Round diameter: 6.2 mm
- 1.5 ct (this page)
- Round diameter: 7.1 mm
- 2 carat ruby
- Round diameter: 7.8 mm
Questions
A round 1.5 carat ruby is about 7.1 mm across. Other shapes are longer than they are wide: an oval is 8.8 x 6.0 mm.
No. A round 1.5 carat ruby is 4% narrower than a 1.5 carat diamond (7.4 mm).
0.30 grams. A carat is 200 milligrams for every gem.
A round 1.5 carat ruby covers 43% of the width of a size 6 finger. Compare it with a ring you have tried on in the finger chart above.