"Diamond Head" redirects here. This article describes the Hawaiian volcano. For other uses, see Diamond Head . i]], USA| Range=Hawaiian Islands| Coordinates=| Topographic map=USGS Honolulu| Type=Volcanic cone| Age=200,000 years| Easiest route=trail and stairway }}Diamond Head is the name of a volcanic tuff cone on the Hawaiian island of Oahu and known to Hawaiian as L?ahi. Its English name was given by British sailors in the 19th century, who mistook calcite crystals embedded in the rock for diamonds. It is located on the coast east of Waik?k?, Honolulu. Geology Diamond Head is part of the complex of cones, vents, and their associated eruption flows that are collectively known to geologists as the Honolulu Volcanic Series, eruptions from the Koolau Volcano that took place long after the volcano formed and had gone dormant. The Honolulu Volcanic Series is a seri

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