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Oppenheimer Diamond

opp·​en·​heim·​er di·​a·​mond | ˈəp-en-hī-mər dī-(ə-)mənd

noun

A 253.7 carat yellow diamond, discovered in South Africa in 1964

The Oppenheimer Diamond is one of the largest uncut diamonds in the world. It measures 20 x 20 millimeters. It currently resides in the Smithsonian Institution.