Abstract
In recent papers static impact tests carried out on different diamond surfaces have been described. Here the quantitative results from these experiments are collected together and are then compared with theoretically derived values for the critical average stress for cracking to be initiated on the different diamond surfaces. Both theoretical and experimental results show that the octahedral face is less resistant to cracking than the cubic face; but theoretical values obtained are of the order of 100 times greater than the corresponding experimental values. This, together with other considerations, is thought to indicate experimentally some sort of flaw distribution in diamond.

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