Aquamarine, with its intense blue/green color of the ocean, is the official birthstone of March. It is also the 19th anniversary stone.
Aquamarine, which come from the Latin "seawater" is popular for use in larger stone settings since it forms in larger crystals. While Aquamarine is blue/green, an Emerald is the solid green version of the same mineral, beryl.
Sailors use to prize Aquamarine because it was the color of the sea. They would fashion it into pendants and talismans which they believed would protect them from the sea and the elements or gain favor with Neptune, the god of the seas. Aquamarine was also believed to enhance the happiness of marriages.
Mineral Group: Beryl
Refractive Index: 1.577 to 1.583
Birefringence: 0.005 to 0.009
Specific Gravity: 2.72
Mohs Hardness: 7.5 to 8.0