Diamond Rock (Rocher du Diamant) is a 175 m (574 feet) high basalt island located south of Fort-de-France, the main port of the Caribbean island of Martinique. The uninhabited island is about 3 kilometers (1.9 mi) from Pointe Diamant. The island gets its name from the reflections that its sides cast at certain hours of the day, which evoke images of a precious stone.