aquamarine QuartzMaterial: brass Length: 6-9 adjustableColor of stone sky blue Aquamarine—the sea water stone—has a very soothing energy. The beautiful aquamarine is associated with March, and so becomes the birthstone of the astrological signs of Pisces (March 1 through 20) and some members of Aries (March 20 through April 20) as well as the Chinese zodiac's sign of the Ox.