Beryl over , and its dimensions were long and in diameter. The largest cut aquamarine gem is the Dom Pedro aquamarine, now housed in the Smithsonian Institution's National Museum of Natural History. The ancient Romans believed that aquamarine would protect against any dangers while travelling at sea, and that it provided energy and cured laziness. Emerald is green beryl, colored by trace amounts of chromium and sometimes vanadium. Most emeralds are highly included, so their brittleness (resistance to breakage) is classified as generally poor. The modern English word "emerald" comes via Middle English "Emeraude", imported from modern French via Old French
USS Aquamarine (PYc-7) for disposal. She was sold to Colonel E. M. Grimm of Columbus, Ohio, in 1947, and her name changed back to "Seawolf". She was sold in 1954 to Ennolls A. Stephens of Irvington, Virginia, owner of The Tides Inn, Irvington, and renamed "Miss Ann". In 2008, "Miss Ann" was sold to private interests who placed her in Charter Service on the Potomac River. In 2014, she is located at the Colonial Beach Yacht Club in Colonial Beach, Virginia. USS Aquamarine (PYc-7) USS "Aquamarine" (PYc-7) was a patrol boat in the United States Navy during World War II. Later known as