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Depending on the geography, one can discover a diamond under or near the water -- an alluvial diamond, or near a volcanic pipe, from which diamonds are subsequently mined.

  • Alluvial diamonds are loose stones that have been carried from the top of a volcanic pipe -- where they erupted to the earth's surface -- by water, and have been carried downstream by the flow. Raw diamond stones are found in the river, or sometimes in the seabed where diamonds are deposited at the mouth of the river where it meets the sea.
  • Volcanic pipes that contain diamonds also contain the trace minerals kimberlite or lamproite, which are scattered over the top of the pipe by natural erosion. Where these trace minerals are spotted, a geologist will inspect the area further for the presence of diamonds. (Only one in 200 such volcanic pipes contains diamonds.)
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14y ago

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