Question

Why is a diamond used for making cutting tools (like glass cutter)but graphite is not?

Answer 1

because diamond is a natural hardest substance the nature and graphite is a soft substance in the nature. diamond is crystalline and graphite is non crystalline form.

Answer 2

Diamond is the hardest material on the earth though they both are carbon compounds but diamond is in crystalline form and graphite is in
non-crystalline form... It is hardest thing