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After weeks of planning, an incision 0.5 inches (13 mm) deep was made to enable Asscher to cleave the diamond in one blow. Making the incision alone took four days, and a steel knife broke on the first attempt, [ 4 ] but a second knife was fitted into the groove and split the stone cleanly in two along one of four possible cleavage planes. [ 21 ]
The millimetre (SI symbol: mm) is a unit of length in the metric system equal to 10 −3 metres ( 1 / 1 000 m = 0.001 m). To help compare different orders of magnitude , this section lists lengths between 10 −3 m and 10 −2 m (1 mm and 1 cm).