How many carats is a 6 mm diamond?
By HeyGema™ · Updated
In short
A 6 mm round diamond weighs about 0.8 carat (0.16 grams). A 6 mm princess cut weighs about 1.3 carat, and an oval that is 6 mm long about 0.42 carat.
- 0.8 ctround diamond, 6 mm
- 0.16 gweight
- 0.24 in6 mm in inches
Carat to mm calculator
About 0.8 carat
An estimate for a well-cut stone. A deep or shallow cut faces up smaller or bigger.
6 mm diamond weight by shape
The weight of a well-cut diamond measuring 6 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: 6 mm
- Weight: 0.8 ct
- Oval
- Size: 6 mm x 4.1 mm
- Weight: 0.42 ct
- Cushion
- Size: 6 mm x 6.0 mm
- Weight: 1.23 ct
- Princess
- Size: 6 mm x 6.0 mm
- Weight: 1.3 ct
- Emerald cut
- Size: 6 mm x 4.3 mm
- Weight: 0.63 ct
- Asscher
- Size: 6 mm x 6.0 mm
- Weight: 1.3 ct
- Radiant
- Size: 6 mm x 4.6 mm
- Weight: 0.79 ct
- Pear
- Size: 6 mm x 3.9 mm
- Weight: 0.35 ct
- Marquise
- Size: 6 mm x 3.0 mm
- Weight: 0.19 ct
- Heart
- Size: 6 mm x 6.0 mm
- Weight: 0.79 ct
- Trillion
- Size: 6 mm x 6.0 mm
- Weight: 0.63 ct
- Baguette
- Size: 6 mm x 3.0 mm
- Weight: 0.42 ct
6 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: 0.8 ct
- Moissanite
- Weight of a round stone: 0.74 ct
- Sapphire
- Weight of a round stone: 0.91 ct
- Ruby
- Weight of a round stone: 0.91 ct
- Emerald
- Weight of a round stone: 0.62 ct
- Aquamarine
- Weight of a round stone: 0.62 ct
- Topaz
- Weight of a round stone: 0.81 ct
- Amethyst
- Weight of a round stone: 0.61 ct
- Spinel
- Weight of a round stone: 0.82 ct
- Tanzanite
- Weight of a round stone: 0.77 ct
- Morganite
- Weight of a round stone: 0.64 ct
6 mm diamond studs
A pair of 6 mm round diamond studs has a total carat weight of about 1.61 carat, 0.8 carat for each stone. See the diamond stud earring size chart.
Nearby sizes
Questions
About 0.8 carat for a well-cut round diamond. A 6.5 mm round is the usual 1 carat size.
A 6 mm princess cut, measured along one side, weighs about 1.3 carat.
A 6 mm round moissanite is labeled 0.8 carat (diamond equivalent weight) and weighs about 0.74 carat. See the moissanite size chart.
6 mm is 0.24 inches.