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
Shades of green of its unofficial mascot, the Dartmouth Indian, in 1974. Dartmouth green and white are the main colors of Lithuanian basketball club Žalgiris Kaunas. "Emerald", also called "emerald green", is a tone of green that is particularly light and bright, with a faint bluish cast. The name derives from the typical appearance of the gemstone emerald. The first recorded use of "emerald" as a color name in English was in 1598. Ireland is sometimes referred to as the "Emerald Isle" due to its lush greenery. The May birthstone is emerald. Seattle is sometimes referred to as the "Emerald City", because its