The conversion is: 0,172 mm = 172 micrometres.
Or 172 micrometres is equal to 0,006 771 633 inch.
Roughly 16mm, but keep in mind that I got that measurement by measuring a few paintballs I had, so it may not be correct.
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.
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The precise measurement is 5.7 mm for the first value and 3.6 m for the second value.
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.
An 18 mm measurement is equivalent to approximately 0.71 inches. To visualize it, 18 mm is slightly larger than a US quarter, which has a diameter of about 24.26 mm. In terms of circumference, if you were to create a circle with a diameter of 18 mm, its circumference would be about 56.5 mm or 2.22 inches.
6 mm is a measurement standing for six millimeters.
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mm means millimeters in measurements
30 mm Is The Largest
634 mm.