The birthstone for the month of March and the 19th wedding anniversary is 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."- GIA
To learn more about Aquamarine please visit http://www.gia.edu/aquamarine