Aquamarine << `ak` wuh muh REEN >> is a light blue or bluish-green gem variety of the mineral beryl. The most popular color is a clear sky-blue. Aquamarine is often treated with heat to improve its color. Almost all aquamarine is transparent. Aquamarine is cut in facets (polished flat surfaces) and used in all types of jewelry. The aquamarine and the bloodstone are the two birthstones for March.
Aquamarines have been known since ancient times. The ancient Romans believed the gem could cure laziness and produce courage. The most important source of aquamarines is Brazil. The gem is also found in Argentina, China, India, Madagascar, Myanmar, Namibia, Northern Ireland, Norway, Russia, and the United States.
See also Beryl; Birthstone (table).
