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They also claimed that small pieces of debris found near Stonehenge, which were traced back to the dig site in Wales, were actually transported by the movement of glaciers over half a million years ago, and not brought by ancient masons along with the bluestones.
Gemstones are removed from mines in the earth, sometimes in the hard rock where they were formed, but also sometimes in gravels where they concentrated after eroding out of the original host rock. Gems of one form or another occur worldwide wherever favorable geologic conditions lead to their formation.