Diamond Head Hawaiian Aloha Shirt Diamond Head Hawaiian Aloha Shirt Diamond Head is Oahu's famous landmark. Geologists say it is the result of an explosive eruption. They believe the volcano is now dormant though, so don't worry. If anything, this shirt is the most explosive thing at the party!Available in small (S), medium (M), large (L), extra large (XL), 2XL.Colors available in navy, cream, and black. Ships with aloha from the island of Oahu. We make these items with care and with hopes of bringing you Hawaiian paradise, where-ever you are!