Gemstone

The chemical formula for an aquamarine gem stone is beryllium aluminum silicate (3BeO Al2 O3 6 SiO2). Its specific gravity is 2.71 and refractive index ranges from 1.574 to 1.580. Its hardness on Mohs scale is between 7.5 and 8. It has a vitreous polish luster.
Aquamarine history and facts
The aquamarine rough was first mined in 1811 in Brazil. However, history has it that it has been used in jewelry much before this time. One of the first documented proofs of the use of aquamarine gemstones exists between 480 and 300 BC. This gem was used by the Greeks to make aquamarine jewelry. In the middle ages, people believed that this gem stone could magical overcome the effects of poison.
Pirates and sailors used small opaque and translucent aquamarine rocks and (some times good quality aquamarine crystals too) as amulets and believed that it would protect them from the raging sea and ensure a safe return. In some parts of the world the aquamarine birthstone is considered to be a symbol of eternal youth, joy and happiness.
While all the aquamarine gemstones are a lovely blue color, they can be found in colors that are bluish-green, blue-green, light greenish-blue, greenish blue, light blue natural and beautiful light blue. The trace element in this case is iron. Regardless of its luster, even the most well polished deepest blue genuine aquamarine gemstone does not match up to the royal blue excellent brilliance of the sapphire gemstone.