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Diamond is the purest allotrope of carbon. In its purest form, diamond is a colourless, lustrous, crystalline solid. Diamonds are usually coloures, some are tinged yellow, some blue, brown, green, pink and even black. This colour is due to some impurity. The grey or black variety of diamonds is known as carbonado and bort. Actually, diamonds are nothing but crystallized carbon atoms. Their brilliance and beauty depend upon the skill with which they are cut and polished. Crystallization of carbon atoms takes place under great heat and pressure.
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