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Diamond Head, cape and celebrated landmark, Honolulu county, southeastern Oahu island, Hawaii, U.S. It lies at the southern edge of Waikiki. An extinct volcanic crater and tuff cone, Diamond Head was the site of a luakini heiau, an ancient ceremonial structure dedicated to a war god and used by the ancient Hawaiians for worship and human sacrifice. Originally called Leahi by native Hawaiians, the feature became known as Diamond Head in 1825 when British sailors...