can't prove it but i heard 3 times.
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Wikipedia lists its cut as "Antique cushion."
Your answer depends on the cut of the diamond in question.
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.
Diamond gemstones are graded according to each diamond's cut, colour, clarity and carat weight.
Given the proper environment, a diamond can cut anything, including another diamond.