Rough diamonds are still in their natural form and have not been cut or polished. Natural diamonds are found in Octhahedra, Cubic, Macle, and Dodecahedron crystal shapes. Unless you have done some research into what rough diamonds look like it unlikely you would be able to spot a diamond in its natural setting.
Before the late 1800s diamonds were found in riverbeds and traded to noblemen who recognize the value of this hard crystal and utili...