How many carats is a 7 mm diamond?
By HeyGema™ · Updated
In short
A 7 mm round diamond weighs about 1.28 carat (0.26 grams). A 7 mm princess cut weighs about 2.06 carat, and an oval that is 7 mm long about 0.67 carat.
- 1.28 ctround diamond, 7 mm
- 0.26 gweight
- 0.28 in7 mm in inches
Carat to mm calculator
About 1.28 carat
An estimate for a well-cut stone. A deep or shallow cut faces up smaller or bigger.
7 mm diamond weight by shape
The weight of a well-cut diamond measuring 7 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: 7 mm
- Weight: 1.28 ct
- Oval
- Size: 7 mm x 4.8 mm
- Weight: 0.67 ct
- Cushion
- Size: 7 mm x 7.0 mm
- Weight: 1.95 ct
- Princess
- Size: 7 mm x 7.0 mm
- Weight: 2.06 ct
- Emerald cut
- Size: 7 mm x 5.0 mm
- Weight: 1 ct
- Asscher
- Size: 7 mm x 7.0 mm
- Weight: 2.06 ct
- Radiant
- Size: 7 mm x 5.4 mm
- Weight: 1.25 ct
- Pear
- Size: 7 mm x 4.5 mm
- Weight: 0.56 ct
- Marquise
- Size: 7 mm x 3.5 mm
- Weight: 0.3 ct
- Heart
- Size: 7 mm x 7.0 mm
- Weight: 1.25 ct
- Trillion
- Size: 7 mm x 7.0 mm
- Weight: 1 ct
- Baguette
- Size: 7 mm x 3.5 mm
- Weight: 0.67 ct
7 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: 1.28 ct
- Moissanite
- Weight of a round stone: 1.17 ct
- Sapphire
- Weight of a round stone: 1.45 ct
- Ruby
- Weight of a round stone: 1.45 ct
- Emerald
- Weight of a round stone: 0.99 ct
- Aquamarine
- Weight of a round stone: 0.98 ct
- Topaz
- Weight of a round stone: 1.28 ct
- Amethyst
- Weight of a round stone: 0.96 ct
- Spinel
- Weight of a round stone: 1.31 ct
- Tanzanite
- Weight of a round stone: 1.22 ct
- Morganite
- Weight of a round stone: 1.02 ct
7 mm diamond studs
A pair of 7 mm round diamond studs has a total carat weight of about 2.56 carat, 1.28 carat for each stone. See the diamond stud earring size chart.
Nearby sizes
Questions
About 1.28 carat for a well-cut round diamond. A 6.5 mm round is the usual 1 carat size.
A 7 mm princess cut, measured along one side, weighs about 2.06 carat.
A 7 mm round moissanite is labeled 1.28 carat (diamond equivalent weight) and weighs about 1.17 carat. See the moissanite size chart.
7 mm is 0.28 inches.