Aquamarine

Aquamarine’s name comes from the Latin for seawater and it was said to calm waves and keep sailors safe at sea. March’s birthstone was also thought to enhance the happiness of marriages. The best gems combine high clarity with limpid transparency and blue to slightly greenish-blue hues. Like many beryls, aquamarine forms large crystals suitable for sizable fashioned gems and carvings. It has been said that the mineral beryl gives the wearer protection against foes in battle or litigation. It makes the wearer unconquerable and amiable and also quickens the intellect. Aquamarine is the birthstone for March and the gem of the 19th wedding anniversary

( https://www.gia.edu/aquamarine-history-lore )