Aquamarine is emerald's most famous sister. It has been credited with providing courage, curing laziness and quickening the intellect. In the Middle Ages it was believed to give the wearer both insight and foresight and freedom from insomnia. Among various peoples, it had the reputation of providing happiness and everlasting youth. Water, in which aquamarine had been soaked, was believed to cure eye troubles, stoppage of breath and hiccups.