How many carats is a 6.5 mm diamond?
By HeyGema™ · Updated
In short
A 6.5 mm round diamond weighs about 1.02 carat (0.20 grams). A 6.5 mm princess cut weighs about 1.65 carat, and an oval that is 6.5 mm long about 0.54 carat.
- 1.02 ctround diamond, 6.5 mm
- 0.20 gweight
- 0.26 in6.5 mm in inches
Carat to mm calculator
About 1.02 carat
An estimate for a well-cut stone. A deep or shallow cut faces up smaller or bigger.
6.5 mm diamond weight by shape
The weight of a well-cut diamond measuring 6.5 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: 6.5 mm
- Weight: 1.02 ct
- Oval
- Size: 6.5 mm x 4.5 mm
- Weight: 0.54 ct
- Cushion
- Size: 6.5 mm x 6.5 mm
- Weight: 1.56 ct
- Princess
- Size: 6.5 mm x 6.5 mm
- Weight: 1.65 ct
- Emerald cut
- Size: 6.5 mm x 4.6 mm
- Weight: 0.8 ct
- Asscher
- Size: 6.5 mm x 6.5 mm
- Weight: 1.65 ct
- Radiant
- Size: 6.5 mm x 5.0 mm
- Weight: 1 ct
- Pear
- Size: 6.5 mm x 4.2 mm
- Weight: 0.45 ct
- Marquise
- Size: 6.5 mm x 3.3 mm
- Weight: 0.24 ct
- Heart
- Size: 6.5 mm x 6.5 mm
- Weight: 1 ct
- Trillion
- Size: 6.5 mm x 6.5 mm
- Weight: 0.8 ct
- Baguette
- Size: 6.5 mm x 3.3 mm
- Weight: 0.54 ct
6.5 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: 1.02 ct
- Moissanite
- Weight of a round stone: 0.94 ct
- Sapphire
- Weight of a round stone: 1.16 ct
- Ruby
- Weight of a round stone: 1.16 ct
- Emerald
- Weight of a round stone: 0.79 ct
- Aquamarine
- Weight of a round stone: 0.79 ct
- Topaz
- Weight of a round stone: 1.03 ct
- Amethyst
- Weight of a round stone: 0.77 ct
- Spinel
- Weight of a round stone: 1.05 ct
- Tanzanite
- Weight of a round stone: 0.97 ct
- Morganite
- Weight of a round stone: 0.81 ct
6.5 mm diamond studs
A pair of 6.5 mm round diamond studs has a total carat weight of about 2.05 carat, 1.02 carat for each stone. See the diamond stud earring size chart.
Nearby sizes
Questions
About 1.02 carat for a well-cut round diamond. A 6.5 mm round is the usual 1 carat size.
A 6.5 mm princess cut, measured along one side, weighs about 1.65 carat.
A 6.5 mm round moissanite is labeled 1.02 carat (diamond equivalent weight) and weighs about 0.94 carat. See the moissanite size chart.
6.5 mm is 0.26 inches.