The Hawaiian name for Diamond Head is Le'ahi. It is a tuff cone (consolidated volcanic ash) crater that was created 300,000 years ago during a single volcanic eruption that spewed ash into the air.

Amanda Norcross, Senior Content & SEO Strategist The 1.6-mile round-trip hike to the top of Koko Head Crater comprises more ... Hanauma Bay Nature Preserve and Diamond Head State Monument.