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Covalent.  Covalent bonding is the sharing of electrons between atoms in order to reach a more stable configuration.  In diamond, a single atom of carbon forms 4 covalent bonds with 4 other carbon atoms.  

Carbon bonding is almost entirely COVALENT.

Carbon is an non metallic element with an atomic number of 6. The electronic configuration of carbon is 2,4. This configuration implies that carbon has four electrons in its outermost shell and it needs four more electron to attain the octet structure. Carbon normally strive to attain the octet structure by forming covalent bonds with other elements. Covalent bond is a type of chemical bond that involves sharing of electron pairs by the participating elements.