Graphite and diamond hardness difference

Diamond carbon atoms are within the "skeleton" shaped arrangement of three-dimensional space, one carbon atom is surrounded by four carbon atom, thus forming a three-dimensional space in a skeleton-like, such a structure contact force uniform in all directions, a strong  Diamond blade  Therefore the diamond has a high  Abrasive grinding wheel . Graphite and diamond hardness vary so much, but people still want to use synthetic methods to obtain diamond, graphite because of the nature  abrasive grinding  are very rich. But to make the carbon graphite are arranged into a diamond like carbon, is not so easy. The late eighteenth century, people began to look for ways of synthesis, until the mid-century. 1938 Rossini scholar thermodynamic calculation, laid the theoretical foundation of synthetic diamond, calculated to make the graphite into a diamond, built to 50-60 years to achieve the above conditions Instrument.