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What is diamond? Of what substance is diamond made?

Diamond is a well-known allotrope of carbon. It is a colourless transparent substance having extraordinary brilliance due to its high refractive index. It is made up carbon which is black.

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35 Explain why, diamond can be used in rock drilling equipment but graphite cannot. 35 State one use of diamond which depend on its ‘extraordinary brilliance’ and use of graphite which depends on its being ‘black and quite soft.’ 36 Describe the structure of diamond. 36 Explain why, diamond has a high melting point.