Nare Diamonds Limited recently announced the discovery of a very rare 235-carat rough diamond from its Schmidtsdrift diamond mine in South Africa. The mine was recently reopened after being purchased from the previous owner who shut down operations three years ago due to bankruptcy.
The mining operations are located on alluvial gravel deposits about 80 kilometers northwest of Kimberley in the Northern Cape Province.
The unusually large, egg-sized diamond is octahedron in shape and reported to be cape yellow color.
In addition to diamonds, minerals commonly exhibiting the simple octahedral form are magnetite, chromite, franklinite, spinel, pyrochlore, cuprite, and gold. Sometimes fluorite, pyrite, and galena also take this crystal structure.