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Diamond, as a rule does not melt or boil under ordinary atmosphere. It simply goes up in smoke (converts directly to CO2 when heated to 800 degrees F in the presence of oxygen).

Its melting point (at very high temps) is roughly 3500 degrees Celsius (very hot), but you need extreme pressure to achieve it (otherwise, it converts to CO2).

Its melting point is the highest of all known materials, in large part because of the covalent bonds and the fact its atoms (carbon) are quite small and thus pack very tightly.

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