The most common geologic setting of diamonds is:

A) crystallization of the water-rich parts of a granite magma, forming pegmatite crystals
B) deposition of minerals by hot waters, such as in a vein
C) replacement of a rock by ore minerals due to hot fluids
D) formation in the mantle and subsequent rise in pipe-like volcanic conduits
E) none of these

Diamonds

Diamonds are a form of carbon arranged in a crystal structure, known to be the hardest natural material, widely used in jewelry and industrial applications.

Pegmatite Crystals

Exceptionally large crystals that form within pegmatite rock, a very coarse-grained igneous rock, often found in cavities that allow for their unobstructed development.

Hot Waters

Water that has been heated naturally or artificially, often found in geothermal springs or produced by water heating systems.