Black Diamond How Are They Made. The two most common allotropes of pure carbon are diamond and graphiteIn graphite the bonds are sp 2 orbital hybrids and the atoms form in planes with each bound to three nearest neighbors 120 degrees apart. Geologists believe that the diamonds in all of Earths commercial diamond deposits were formed in the mantle and delivered to the surface by deep-source volcanic eruptions.
Diamonds are formed from carbon under intense heat and pressure. Being slightly cellular its specific gravity is rather less than that of crystallized diamond. Synthetic diamonds are made at about 300deg C but usually in a pressure vessel using microwave radiation and a seeding crystal.
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But in other words while regular natural colored diamonds get their color due to impurities that are attached to them during the formation process for example boron causes blue diamonds black diamonds are similar to white diamonds that have an extremely high amount of inclusions clusters of graphite inside of them to the point that they simply appear black. Temperatures boiled above 2000 degrees Fahrenheit and pressure exceeded 725000 pounds per square inch. Black diamonds however are more similar to white diamonds than yellow or blue diamonds for example. Diamonds form at depths of around 90 miles 150km over millions and millions of years.
