How many carats is a 15 mm diamond?
By HeyGema™ · Updated
In short
A 15 mm round diamond weighs about 12.58 carat (2.52 grams). A 15 mm princess cut weighs about 20.29 carat, and an oval that is 15 mm long about 6.62 carat.
- 12.58 ctround diamond, 15 mm
- 2.52 gweight
- 0.59 in15 mm in inches
Carat to mm calculator
About 12.58 carat
An estimate for a well-cut stone. A deep or shallow cut faces up smaller or bigger.
15 mm diamond weight by shape
The weight of a well-cut diamond measuring 15 mm. For round and square shapes the number is the diameter or the side. For longer shapes it is the long side, with the width following the usual ratio.
- Round
- Size: 15 mm
- Weight: 12.58 ct
- Oval
- Size: 15 mm x 10.3 mm
- Weight: 6.62 ct
- Cushion
- Size: 15 mm x 15.0 mm
- Weight: 19.22 ct
- Princess
- Size: 15 mm x 15.0 mm
- Weight: 20.29 ct
- Emerald cut
- Size: 15 mm x 10.7 mm
- Weight: 9.84 ct
- Asscher
- Size: 15 mm x 15.0 mm
- Weight: 20.29 ct
- Radiant
- Size: 15 mm x 11.5 mm
- Weight: 12.29 ct
- Pear
- Size: 15 mm x 9.7 mm
- Weight: 5.47 ct
- Marquise
- Size: 15 mm x 7.5 mm
- Weight: 3 ct
- Heart
- Size: 15 mm x 15.0 mm
- Weight: 12.29 ct
- Trillion
- Size: 15 mm x 15.0 mm
- Weight: 9.84 ct
- Baguette
- Size: 15 mm x 7.5 mm
- Weight: 6.59 ct
15 mm stones in other gems
A round stone of the same size weighs differently in each gem, because gems differ in density.
- Diamond
- Weight of a round stone: 12.58 ct
- Moissanite
- Weight of a round stone: 11.51 ct
- Sapphire
- Weight of a round stone: 14.29 ct
- Ruby
- Weight of a round stone: 14.29 ct
- Emerald
- Weight of a round stone: 9.72 ct
- Aquamarine
- Weight of a round stone: 9.65 ct
- Topaz
- Weight of a round stone: 12.61 ct
- Amethyst
- Weight of a round stone: 9.47 ct
- Spinel
- Weight of a round stone: 12.86 ct
- Tanzanite
- Weight of a round stone: 11.97 ct
- Morganite
- Weight of a round stone: 10 ct
15 mm diamond studs
A pair of 15 mm round diamond studs has a total carat weight of about 25.16 carat, 12.58 carat for each stone. See the diamond stud earring size chart.
Nearby sizes
Questions
About 12.58 carat for a well-cut round diamond.
A 15 mm princess cut, measured along one side, weighs about 20.29 carat.
A 15 mm round moissanite is labeled 12.58 carat (diamond equivalent weight) and weighs about 11.51 carat. See the moissanite size chart.
15 mm is 0.59 inches.