Diamonds can be found in various geologic features, but one common location is kimberlite pipes. Kimberlites are volcanic rocks that are known to carry diamonds from deep within the Earth's mantle. These pipes are typically cylindrical or funnel-shaped and can range in size from a few meters to several kilometers in diameter. Diamonds are brought to the surface through volcanic activity and can be found in the kimberlite rock or in the surrounding area. Other geologic features associated with diamond formation include lamproite pipes, alluvial deposits, and placer deposits.