South America. Brazil. Sedimentary deposits of diamonds were discovered in 1725. Black slaves in a mine, under the supervision of foremen, performing the washing process for the separation of the diamond from the slag. Illustration, 18th century.
South America. Brazil. Sedimentary deposits of diamonds were discovered in 1725. Black slaves in a mine, under the supervision of foremen, performing the washing process for the separation of the diamond from the slag. Illustration, 18th century.