The Aqua Chalcedony gemstone is the birthstone for March. It is also the gemstone associated with the Zodiac sign Pisces. The prefect gift for a March birthday, Aqua Chalcedony also symbolises loyalty and friendship. A beautiful bright aquamarine coloured stone, Aqua Chalcedony was popular in ancient times and prized for its turquoise colour. Although Chalcedony comes in a range of colours, Aqua or Blue Chalcedony is the most highly prized. This is a stone which will lift the spirits and elevate any outfit. It is also believed to encourage sleep and relaxation.