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.
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A 2 mm round diamond weighs about .03 carats, so a 1.5 mm round diamond would be smaller than .03 carats. A .01 carat diamond is about as big as a grain of sand.
The only factual answer possible is this: one measurement of the diamond is 2.2 mm. If the diamond is a round brilliant cut, it's possible that a diamond of this measurement weighs about .04 carats or 04/100ths of a carat.
A 20 carat diamond weighs 20 carats. If the diamond is a round brilliant cut, it measures about 17.6 mm at the girdle.
The millimeter size of a diamond of this weight varies, depending on the cut. If the gem is round cut, its measurement at the girdle will be between 16.3 mm (15 carats) and 17.6 mm (20 carats).
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.