The state stone of Hawaii is the black coral, which can be found surrounding any of the state's islands. It was designated as the state stone in 1987.
The state of Hawaii designated black coral as its state stone or gem. Black coral can range in size as small as 1 millimeter and grow to be as large as 6 feet high. There are more than 150 species of black coral around the world, with 14 of them being native to Hawaii.
The black coral colonies found off the shores of Hawaii serve as habitats for a variety of creatures, including fish and bivalves. Outside of the water, black coral has been used in medicine and as a charm for years. It is thought to ward off injury and evil.