How big is a 10 carat amethyst?
By HeyGema™ · Updated
In short
A 10 carat round amethyst measures about 15.3 mm across (0.60 inches), 10% wider than a 10 carat diamond (13.9 mm). An oval of the same weight is 18.9 x 13.0 mm and an emerald cut 16.6 x 11.8 mm.
- 15.3 mmround amethyst, across
- 0.60 inthe same in inches
- 2.00 gweight
- 93%of a size 6 finger's width
Carat to mm calculator
About 15.3 x 15.3 mm
An estimate for a well-cut stone. A deep or shallow cut faces up smaller or bigger.
Round
15.3 mm
Oval
18.9 x 13.0 mm
Cushion
13.3 x 13.3 mm
Princess
13.0 x 13.0 mm
Emerald cut
16.6 x 11.8 mm
Asscher
13.0 x 13.0 mm
Radiant
15.4 x 11.8 mm
Pear
20.1 x 13.0 mm
Marquise
24.6 x 12.3 mm
Heart
15.4 x 15.4 mm
Trillion
16.6 x 16.6 mm
Baguette
18.9 x 9.5 mm
= 5 mm in every picture above
10 carat amethyst size by shape
Face-up measurements of a well-cut 10 carat amethyst. Amethyst is lighter than diamond (2.65 against 3.52), so the same weight gives a bigger stone, 10% wider across.
- Round
- Length x width: 15.3 mm
- In inches: 0.60 in
- Oval
- Length x width: 18.9 x 13.0 mm
- In inches: 0.75 x 0.51 in
- Cushion
- Length x width: 13.3 x 13.3 mm
- In inches: 0.52 x 0.52 in
- Princess
- Length x width: 13.0 x 13.0 mm
- In inches: 0.51 x 0.51 in
- Emerald cut
- Length x width: 16.6 x 11.8 mm
- In inches: 0.65 x 0.47 in
- Asscher
- Length x width: 13.0 x 13.0 mm
- In inches: 0.51 x 0.51 in
- Radiant
- Length x width: 15.4 x 11.8 mm
- In inches: 0.61 x 0.47 in
- Pear
- Length x width: 20.1 x 13.0 mm
- In inches: 0.79 x 0.51 in
- Marquise
- Length x width: 24.6 x 12.3 mm
- In inches: 0.97 x 0.48 in
- Heart
- Length x width: 15.4 x 15.4 mm
- In inches: 0.61 x 0.61 in
- Trillion
- Length x width: 16.6 x 16.6 mm
- In inches: 0.65 x 0.65 in
- Baguette
- Length x width: 18.9 x 9.5 mm
- In inches: 0.75 x 0.37 in
10 carat amethyst against other gems
- Diamond
- Round, 10 carat: 13.9 mm
- Moissanite
- Round, 10 carat: 14.3 mm
- Sapphire
- Round, 10 carat: 13.3 mm
- Ruby
- 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
- Amethyst (this page)
- Round, 10 carat: 15.3 mm
10 carat amethyst on a finger
- 4
- Finger width: 14.9 mm
- Round covers: 103%
- Oval covers: 88%
- 5
- Finger width: 15.7 mm
- Round covers: 97%
- Oval covers: 83%
- 6
- Finger width: 16.5 mm
- Round covers: 93%
- Oval covers: 79%
- 7
- Finger width: 17.3 mm
- Round covers: 88%
- Oval covers: 75%
- 8
- Finger width: 18.1 mm
- Round covers: 84%
- Oval covers: 72%
- 9
- Finger width: 18.9 mm
- Round covers: 81%
- Oval covers: 69%
Amethyst at nearby weights
- 5 carat amethyst
- Round diameter: 12.1 mm
- 10 ct (this page)
- Round diameter: 15.3 mm
Questions
A round 10 carat amethyst is about 15.3 mm across. Other shapes are longer than they are wide: an oval is 18.9 x 13.0 mm.
Yes. A round 10 carat amethyst is 10% wider than a 10 carat diamond (13.9 mm).
2.00 grams. A carat is 200 milligrams for every gem.
A round 10 carat amethyst covers 93% of the width of a size 6 finger. Compare it with a ring you have tried on in the finger chart above.