These two measurements are not directly related. If the diamond is cut in a round, brilliant cut, the carat weight may be between .15 and .20 carats. If the diamond is of a different cut, then the carat weight will be different.
A four-carat round cut diamond measures about 10mm at the girdle. Different cuts would have various mm measurements for each weight.
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 measurement you give -- 055 -- is converted to .55 carat, and the diamond is a round brilliant cut diamond, the diameter of the diamond at the girdle is between 5.2 MM and 5.6 MM, being the MM measurements of .50 and .60, respectively.
Depending on the cut, a five carat diamond always weighs five carats. If the cut is round brilliant, the mm measurement at the girdle is about 11.
Every diamond is valued according to its colour, carat weight, clarity and cut. You've offered a MM measurement, which isn't a criteria of a diamond's worth.
A half carat diamond of this cut measures 5.2 mm at the girdle; a .65 carat diamond measures 5.6 mm at the girdle. A certified gemologist can give you the exact carat weight of your diamond.
1 carat = 6.5 mm
A 1.75 carat diamond billiant cut is about 7.8 mm and a 2.00 carat stone is about 8.2 mm at the girdle. In order to know the exact carat weight of a stone, one must take it to a certified gemologist and ask that it be removed from its setting and weighed.
A four-carat round cut diamond measures about 10mm at the girdle. Different cuts would have various mm measurements for each weight.
A two carat round brilliant cut stone will measure about 8.2 mm. A different cut will have a different measurement.
At the girdle, this stone would measure about 6.5 mm.
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.
Usually, a brilliant cut diamond that weighs one carat measures about 6.5 mm at the girdle.
The diamond weighs .125 carats. Its mm measurements depend on the cut.
The weight of one carat weight is equal to 0.2 grams or 0.007 ounces. A one carat diamond with a round shape is approximately 6.5 mm in diameter. The value will vary depending on the cut and clarity of the stone.
A round cut diamond, cut to industry standards, that is 5.1 mm across the face of the diamond (the top) weighs half a carat.
If the measurement you give -- 055 -- is converted to .55 carat, and the diamond is a round brilliant cut diamond, the diameter of the diamond at the girdle is between 5.2 MM and 5.6 MM, being the MM measurements of .50 and .60, respectively.