Dubbed “The Sailor’s Stone,” March’s birthstone, the aquamarine, was thought to protect sailors and people traveling by water. A member of the beryl family, it typically ranges in color from pale sky blue to a deep blue-green. Medieval alchemists believed the gem could prevent excess water retention and enhance the body’s digestive and eliminative functions. It is thought that Neptune, King of the Sea, gifted mermaids with the aquamarine, inspiring love among its recipients.