The stone is found in nature in blue or greenish blue tinge and is often heated to change the tinge. Strictly speaking deep blue tinge is preferred. Because of its hardness (7.5 on Moh scale) it is not brittle however normal care is necessary.
Aquamarine is chemically known as beryllium aluminum silicate and found extensively in mountainous terrain of Pakistan although to a lesser amount in other parts of the world viz Russia, China, Burma, Brazil etc.
It has a specific gravity of around 2.6 and refractive index of 1.59. This is a blue gemstone that is tied around the upper arm of children born in March.
In India it is called ‘beruj’ in the trading circles. According to legend aquamarine stones were valued treasure of mermaids; known to and extensively used by the Greeks from the fifth century B.C.
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