Physicist J Robert Oppenheimer was not related to "diamond" Oppenheimers--

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No, the physicist J. Robert Oppenheimer was not related to the diamond Oppenheimer family.

Explanation

The diamond Oppenheimer family includes Sir Ernest Oppenheimer (1880-1957), who founded the Anglo American Corporation of South Africa and controlled De Beers.

J. Robert Oppenheimer was a renowned physicist who worked on the Manhattan Project. His younger brother, Frank Oppenheimer, also worked on the Manhattan Project.

The Oppenheimer name has also been associated with the mutual-fund company OppenheimerFunds.