Aquamarine has historically become associated with the sea due to its color and has been used in jewelry as early as 500 BC, if not before. The blue tones that remind us of the ocean give us images of the water and sky.
At one point, people believed aquamarine was a treasure from mermaids because of its rich history of being associated with the sea. As a result, sailors wore it to protect them against seasickness or becoming shipwrecked.
Several legends are told about this stone, and they all relate to the ocean or sea. One legend is that the gem is strongest when it has been held underwater for some time. If someone thought the gem's powers were low, they would place it in the water overnight under a full moon to bring its powers back. Just like when your phone dies and you place it in a bowl of rice overnight to cure it (okay not really the same, but you get the idea).Another legend is that if a sailor is dealing with a storm while out on the sea, they can throw their aquamarine overboard to calm the gods. Romans and ancient Greeks alike believed in this practice.
Aquamarine jewelry is said to aid relationships, so it makes for a great wedding or anniversary gift.