HARDEST SUBSTANCE.: ITS A Diamond???

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• Untill now we know that Diamond is the hardest substance found in earth. Diamond is a allotrope of carbon. It is non metal and having highest refractive index. Thats the reason why diamond reflect not shine. In common language we say that diamond shine but in reality its just reflect the light. 
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• Till now diamond is used for cutting grinding and for making expensive jewellery. It also ome of the expensive substance but recently scientists had discovered one of the hardest substance more harder than Diamond and its called graphine. 
• It is also an allotrope of carbon. It is obtain from graphite. 
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