Jewels and Gems
“In a poem written in the fourteenth century, ‘The Vision of Piers the Plowman,’ the wearer of an aquamarine was said to be miraculously protected from the ravages of poisoning. At one time, it was believed that the stone quickened the intellect, but according to Camillus Leonardus its essential quality was to cure distemper of the throat and jaws,”
-Jewels & Gems by Mona Curran