Aquamarine got its name from its sealike colour. The dark blue is the most desired colour but the most rarest, its colours can be improved with neutron and gamma irradition, but these changes are unfortuunately not permanent. This gemstone is very brittle and cannot withstand lots of pressue before it breaks and shatters. 

You can find this stone in Australia, Burma, Brazil, China, India, Kenya, Madagascar, Nigeria, Russia and the United States of America. The largest Aquamarine ever found was in the Minas Gerais (Brazil), it weighed 110.5kg and was 18 inches long and 15.5 inches wide.