In the Middle Ages, rubies were thought to bring good health, as well as guard against wicked thoughts, amorous desires, and disputes. Rubies, along with other types of red stones, were said to cure bleeding. And it was believed that the ruby held the power to warn its owner of coming misfortunes, illness, or death, by turning darker in color. It is said that Catherine of Aragon, first wife of King Henry VIII, predicted her downfall in seeing the darkening of her ruby.
Pictured: Natural ruby with inclusions