A round brilliant cut stone weighing five carats measures about 11mm at the girdle. A rose cut diamond has fewer facets than a round brilliant, so this number can only be an estimate.
A two-carat round cut measures in diameter about 8.2mm at the girdle.
If the diamond is a round brilliant cut, the measurement at the girdle of a diamond of this carat weight measures about 5.2 mm. If the diamond is not a round brilliant cut, the measurement will be different.
The designation .30 carats indicates that the diamond weighs 30/100ths of a carat. The mm size will depend on its cut.
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
Same as a rectangle. It is, after all, a type of rectangle (lenght >< width)
A two-carat round cut measures in diameter about 8.2mm at the girdle.
A 1.00 carat round brilliant, when properly cut, should measure approximately 6.5 mm in diameter.
In terms of a round brilliant diamond, a properly cut stone should measure approximately 5.2 mm in diameter.
The diamond weighs one carat. Its other dimensions depend on its cut: round, princess, emerald and so forth. A carat is 0.2 grams; a pure diamond has a density of 3.5 gm cm-3 which translates to a volume of 0.057 cm3 per carat. As stated in the first answer the linear dimensions depend on the shape that is cut.
A two carat round brilliant cut stone will measure about 8.2 mm. A different cut will have a different measurement.
If the diamond is a round brilliant cut, the measurement at the girdle of a diamond of this carat weight measures about 5.2 mm. If the diamond is not a round brilliant cut, the measurement will be different.
If its a round brilliant cut diamond, it will be between 4.5 and 4.8mm depending on the diamond cut proportions
It depends on the shape. For e.g. a 1 carat round brilliant diamond has a width of 6,5 mm. Other shapes, such as a marquise diamond is cut to be a longer shape. A one carat marquise diamond would be about 10 mm x 4,75 mm. Oval, pear and emerald along with the marquise shape visually appear larger than the round and square shapes.
The designation .30 carats indicates that the diamond weighs 30/100ths of a carat. The mm size will depend on its cut.
Depends on the cut. Carat is a measure of weight, not length, width, depth, area, or volume. What you are asking is kind of like asking how many inches is a pound of lead.Another AnswerIf the quarter carat diamond is a round cut, its mm measurement at the girdle is 4.1. If the cut is a different cut, see the answer, above.
Carats indicates weight; mm indicates length and width -- the two are not necessarily compatible. However, if your diamond is a round brilliant cut diamond and its diameter at the girdle is 10mm, the diamond may be about four carats. If the cut is another shape, it may have a different carat weight.
Since cushion cut is a rather square cut, one must assume that your diamond measures 7mm x 7mm. In this case, it weighs approximately two carats.