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The occurrence of natural diamonds is remarkable and important to earth studies.

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The examination of their production, dispersal, and applications is an aid to the reconstruction of past vegetation and climates and developing relative chronologies.Research into natural diamonds (figure 1) has emerged over the last two decades as one of the keys to understanding the deep earth.Analytical advances, improved geologic knowledge, and the emergence of new diamond-producing regions (such as the Slave craton of Canada) have all contributed to this change.Each kind of flowering plant produces pollen that is unique and pollen grains have tough coverings that can last a long time.The resilient exine of the pollen and spores is preserved in anaerobic environments, such as lakes and bogs, and some acidic and dry soils, as in caves.