Comparison of material hardness:
The fabulous hardness and superiority of the ultra-hard material diamond becomes really apparent when directly compared with other materials. In principle, hardness is equivalent to the resistance that a body has when opposed to another body. Harder materials scratch softer ones – This is a basic principle of all hardness scales. At the top stand diamond – and sinse recently hi-tech diamond, used for the first time in what manufacture by Rado, a pioneering achievement that brought Rado an entry in the Guinness Book of Records.