A four-carat round cut diamond measures about 10mm at the girdle. Different cuts would have various mm measurements for each weight.
Currently, in the 'brilliant' round diamond cut, you can find 58 facets.
If the diamond is measured in points -- 106, you could translate this to 1.06 carats.
If the diamond is a round cut, the measurement would be 7.4 mm at the girdle. If the diamond is of another cut, the measurement would be different.
If the diamond is a round brilliant cut, the 3mm measurement at the girdle indicates that the diamond weighs about 1/10th of a carat, or .10 carats.
The weight of a carot is equal to 200 milligrams. Carots are used to measure and weigh diamonds. A diamond's worth is determined by how many carots it has.
A four-carat round cut diamond measures about 10mm at the girdle. Different cuts would have various mm measurements for each weight.
This diamond could weigh about six carats if its measurement is 10mm x 10mm.
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.
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Currently, in the 'brilliant' round diamond cut, you can find 58 facets.
A round cut diamond weighing .25 carats measures 4.1mm at the girdle.
A one-half carat diamond, in a round brilliant cut, measures about 5.2MM at the girdle.
58 facets
Note: carrots grow in gardens; karat is a purity measurement for gold; carat is a weight measurement for gemstones. Most gem-quality diamonds are about the size of a pea.
A round, brilliant cut diamond measuring 6.5 mm at the girdle weighs about one carat.
A 6mm stone would be a.75 carat diamond.