Aquamarine is March's birthstone
Aquamarines, which are a form of the mineral beryl, range from blue-green to deep blue. Naturally occuring deep-blue aquamarines are the rarest and most valuable. Some of these crystals weigh more than 250 pounds. (Take the gemstone personality quiz!)
People used to believe that aquamarines could protect sailors and their ships from disasters at sea. The gem was also thought to heal illnesses that affected the stomach, liver, jaws, and throat.