How many carats is a 1 mm diamond?
By HeyGema™ · Updated
In short
A 1 mm round diamond weighs about 0.0040 carat (0.001 grams). A 1 mm princess cut weighs about 0.010 carat, and an oval that is 1 mm long about 0.0000 carat.
- 0.0040 ctround diamond, 1 mm
- 0.001 gweight
- 0.04 in1 mm in inches
Carat to mm calculator
About 0 carat
An estimate for a well-cut stone. A deep or shallow cut faces up smaller or bigger.
1 mm diamond weight by shape
The weight of a well-cut diamond measuring 1 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: 1 mm
- Weight: 0.0040 ct
- Oval
- Size: 1 mm x 0.69 mm
- Weight: 0.0020 ct
- Cushion
- Size: 1 mm x 1.00 mm
- Weight: 0.0060 ct
- Princess
- Size: 1 mm x 1.00 mm
- Weight: 0.0060 ct
- Emerald cut
- Size: 1 mm x 0.71 mm
- Weight: 0.0030 ct
- Asscher
- Size: 1 mm x 1.00 mm
- Weight: 0.0060 ct
- Radiant
- Size: 1 mm x 0.77 mm
- Weight: 0.0040 ct
- Pear
- Size: 1 mm x 0.65 mm
- Weight: 0.0020 ct
- Marquise
- Size: 1 mm x 0.50 mm
- Weight: 0.0010 ct
- Heart
- Size: 1 mm x 1.00 mm
- Weight: 0.0040 ct
- Trillion
- Size: 1 mm x 1.00 mm
- Weight: 0.0030 ct
- Baguette
- Size: 1 mm x 0.50 mm
- Weight: 0.0020 ct
1 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: 0.0040 ct
- Moissanite
- Weight of a round stone: 0.0030 ct
- Sapphire
- Weight of a round stone: 0.0040 ct
- Ruby
- Weight of a round stone: 0.0040 ct
- Emerald
- Weight of a round stone: 0.0030 ct
- Aquamarine
- Weight of a round stone: 0.0030 ct
- Topaz
- Weight of a round stone: 0.0040 ct
- Amethyst
- Weight of a round stone: 0.0030 ct
- Spinel
- Weight of a round stone: 0.0040 ct
- Tanzanite
- Weight of a round stone: 0.0040 ct
- Morganite
- Weight of a round stone: 0.0030 ct
1 mm diamond studs
A pair of 1 mm round diamond studs has a total carat weight of about 0.0070 carat, 0.0040 carat for each stone. See the diamond stud earring size chart.
Nearby sizes
Questions
About 0.0040 carat for a well-cut round diamond.
A 1 mm princess cut, measured along one side, weighs about 0.010 carat.
A 1 mm round moissanite is labeled 0.0040 carat (diamond equivalent weight) and weighs about 0.0000 carat. See the moissanite size chart.
1 mm is 0.04 inches.