Question

why only diamond can cut only a diamond

Answer 1

because it is hardest carbon compound so diamond is use to cut a diqmond like iron is use to cut iron

Answer 2

Hi mate!!!

Here is your answer

The hardness of the diamond prevents arbitrary cleaving; instead, the shape of a diamond cut is related to the natural shape of the rough stone. Using these imperfect stones as cutting grit belies the main theory: only a diamond can truly cut another diamond.

Thanks for asking...