How big is a 1.5 carat tanzanite?
By HeyGema™ · Updated
In short
A 1.5 carat round tanzanite measures about 7.5 mm across (0.30 inches), 2% wider than a 1.5 carat diamond (7.4 mm). An oval of the same weight is 9.3 x 6.4 mm and an emerald cut 8.1 x 5.8 mm.
- 7.5 mmround tanzanite, across
- 0.30 inthe same in inches
- 0.30 gweight
- 45%of a size 6 finger's width
Carat to mm calculator
About 7.5 x 7.5 mm
An estimate for a well-cut stone. A deep or shallow cut faces up smaller or bigger.
Round
7.5 mm
Oval
9.3 x 6.4 mm
Cushion
6.5 x 6.5 mm
Princess
6.4 x 6.4 mm
Emerald cut
8.1 x 5.8 mm
Asscher
6.4 x 6.4 mm
Radiant
7.6 x 5.8 mm
Pear
9.9 x 6.4 mm
Marquise
12.1 x 6.1 mm
Heart
7.6 x 7.6 mm
Trillion
8.1 x 8.1 mm
Baguette
9.3 x 4.7 mm
= 5 mm in every picture above
1.5 carat tanzanite size by shape
Face-up measurements of a well-cut 1.5 carat tanzanite. Tanzanite is lighter than diamond (3.35 against 3.52), so the same weight gives a bigger stone, 2% wider across.
- Round
- Length x width: 7.5 mm
- In inches: 0.30 in
- Oval
- Length x width: 9.3 x 6.4 mm
- In inches: 0.37 x 0.25 in
- Cushion
- Length x width: 6.5 x 6.5 mm
- In inches: 0.26 x 0.26 in
- Princess
- Length x width: 6.4 x 6.4 mm
- In inches: 0.25 x 0.25 in
- Emerald cut
- Length x width: 8.1 x 5.8 mm
- In inches: 0.32 x 0.23 in
- Asscher
- Length x width: 6.4 x 6.4 mm
- In inches: 0.25 x 0.25 in
- Radiant
- Length x width: 7.6 x 5.8 mm
- In inches: 0.30 x 0.23 in
- Pear
- Length x width: 9.9 x 6.4 mm
- In inches: 0.39 x 0.25 in
- Marquise
- Length x width: 12.1 x 6.1 mm
- In inches: 0.48 x 0.24 in
- Heart
- Length x width: 7.6 x 7.6 mm
- In inches: 0.30 x 0.30 in
- Trillion
- Length x width: 8.1 x 8.1 mm
- In inches: 0.32 x 0.32 in
- Baguette
- Length x width: 9.3 x 4.7 mm
- In inches: 0.37 x 0.18 in
1.5 carat tanzanite 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
- Ruby
- 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
- Topaz
- Round, 1.5 carat: 7.4 mm
- Tanzanite (this page)
- Round, 1.5 carat: 7.5 mm
1.5 carat tanzanite on a finger
- 4
- Finger width: 14.9 mm
- Round covers: 50%
- Oval covers: 43%
- 5
- Finger width: 15.7 mm
- Round covers: 48%
- Oval covers: 41%
- 6
- Finger width: 16.5 mm
- Round covers: 45%
- Oval covers: 39%
- 7
- Finger width: 17.3 mm
- Round covers: 43%
- Oval covers: 37%
- 8
- Finger width: 18.1 mm
- Round covers: 41%
- Oval covers: 35%
- 9
- Finger width: 18.9 mm
- Round covers: 40%
- Oval covers: 34%
Tanzanite at nearby weights
- 1 carat tanzanite
- Round diameter: 6.6 mm
- 1.5 ct (this page)
- Round diameter: 7.5 mm
- 2 carat tanzanite
- Round diameter: 8.3 mm
Questions
A round 1.5 carat tanzanite is about 7.5 mm across. Other shapes are longer than they are wide: an oval is 9.3 x 6.4 mm.
Yes. A round 1.5 carat tanzanite is 2% wider 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 tanzanite covers 45% of the width of a size 6 finger. Compare it with a ring you have tried on in the finger chart above.