BIRTHSTONE OF THE MONTH If you were born in March you have two gemstone options. Both gems are precious and rich in historic lore. Aquamarine, a form of greenish blue beryl, is clear and sparkling as seawater and was a talisman for early sailors. Ancient bloodstone is dark green and named for the bright flashes of red jasper that dots its surface. It has been a long time favorite for men's rings. Both gems represent courage for the March born.