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Igneous, it is brought to the surface as an igneous Xenolith. The diamond crystal itself is of metamorphic origin it is metamorphosed carbon.

It is more closely related to igneous rocks, as diamond forms in magma under very high temperatures and pressures, where there is no appreciable oxygen to burn the carbon.

Artificial diamonds can be "grown" in a similar way by accumulating individual carbon crystals from a hot plasma (gas), in a process called chemical vapor deposition.

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Q: Is diamond an igneous or sedimentary rock?
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