Aquamarine is a blue-green variety of the mineral Beryl. Aquamarine means "sea water" and amulets of this stone engraved with a depiction on Poseidon were believed to protect sailors. It is associated with cleansing, serenity, inspiration, tranquility, peace and strength. It calms fears and helps us get in touch with the nature spirits of the sea, as well as promoting safe travel on water. It is useful for someone seeking closure, as it offers emotional perspective. Aquamarine also is said to protect from perils of the sea, including seasickness.