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It's impossible to give a precice answer to your question as a carat is an unit of weight, while a millimeter is a unit of area. Depending on how the stone is cut ( the cut of a stone is more a pattern and number of facets, ie: the brilliant cut must a) have a round girdle and b) have at least 56 facets. there have been brilliants cut with up to 146 facets ( to the best of my knowledge). Then there is the matter of shape. An one carat brilliant will have a much different set of measures than a one carat emerald ( rectangular) cut. Finaly there are the variations caused by the cutter himself as he makes decisions on what angles and sizes of the facets themselves ( as long as they are proportionate within the cut) will best show and flatter the stone. With all that said, I have seen one carat brilliants that have ranged from roughly 5.5 to 7 mm across the top depending on depth of cut, size of crown and table ( table = flat, crown = area between table and girdle) and width of girdle ( the ring around the widest part of the edge). I am sorry that this is probably not the exact # you were looking for, but it is the most exact I can give. If you are in the market for a stone, rather than a precise top measure, you will be better off sticking to the 4 C's ; Cut, Carat, Clarity, and Colour. That, a little research on your own ( gotta love the net!) and the help of a reputable jeweler are the keys to best balancing the beauty and the cost of each stone.
a typical round faceted 1 carat diamond is 6.5mm or nearly 1/4 inches wide

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Related Questions

Is 1 carat round diamond the same as 7 millimeters?

No. Different cuts of diamond stones have different measuremenets, which are never directly related to the carat weight of the gem.


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How big is a 1 carat ring?

A common misconception. Carat is nothing to do with size. Carat is related to weight and therefore a 1 carat stone depends on the gemstone in question and its cut. 1 carat is 0.2g and a 1 carat round-cut diamond is approximately 6.5mm in diameter. Similarly, since CZ is a diamond simulant, a 1 carat round-cut CZ is also deemed to be one that is 6.5mm in diameter but such a stone actually weighs more than 0.2g because CZ is more dense than diamond.


What does a one carat diamond look like?

A 1.00 carat round brilliant, when properly cut, should measure approximately 6.5 mm in diameter.


How large is a one carat diamond?

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What is the average price of a carat in diamonds?

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What is the volume of a 1 carat diamond if 1 carat is 200 mg?

To calculate the volume of a 1 carat diamond, we first need to convert the carat weight to grams. Since 1 carat is 200 mg, it is equal to 0.2 grams. The volume of a diamond can vary depending on its shape, so without knowing the specific shape of the diamond, we cannot determine its volume.


What is the weight of 1 ct diamond?

A one carat diamond weighs one carat, or .20 grammes.


What is the weight of 1 carat diamond in grams?

One carat is equal to 200 milligrams, or in other words, a 5-carat stone weighs 1 gram.


How many milligrams does a 1-carat diamond weigh?

One carat diamond weight is equal to .20 grammes.


What is the weight of a 1 carat diamond in milligrams?

One carat of diamond weight equals 0.2 grams. One gram equals 1000 milligrams. Can you do the math?