how are diamonds formed in nature

Dear Student, 

Diamond begins its journey of formation from the upper mantle of the earth's crust. 

You remeber we have studied that the earth is believed to be made of three distinct layers? These are the crust, the mantle and the core. The core is again believed to have inner and outer cores. 

Mantle is the layer where the birth of diamond actually takes place. This is at a considerable depth (120 miles approx.) below the earth's surface. diamond is nothing but an allotropic form of carbon only. The carbon that makes diamond is a result of melting of pre-existing rocks in the upper mantle. Dear Studentgh temperature and pressure conditions force the carbon to move down where it finally melts. A stage comes when the temperature drops and some pressure gets released. This occurs due to some natural phenomenon such as tectonic movements (a term used in geology which means the movement of layers or plates inside the earth's crust). The correct combination of pressure and temperature makes the molten material solidify to form diamonds and come somewhere near the earth's surface. The diamond is then mined.

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 Diamonds form as crystals and are composed of pure carbon (C). Diamonds are one of the few stones that are made up of a single element, Carbon. They form while under tremendous heat and pressure. The only place where these types of conditions exist are deep beneath the Earth's surface, about 150km to200km (90 to 120 miles) below the surface with temperatures ranging from 900 to 1300 on the Celsius scale. When these two actions interact together, Carbon atoms are literally forced together combining their cubic molecular form, and ultimately creating diamond crystals. This is how diamonds are formed. 

 
 
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u get one thumb up.

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