Gemstones have various meanings and associations according to their type and the month. The garnet, representing constancy and cheerfulness, was used as a charm against disease in the Middle Ages. The amethyst, meaning sincerity, was considered fortunate for lovers, businessmen and hunters as it calms fears and cures diseases. The bloodstone, symbolizing courage, was thought to protect from disease and accidents. The diamond, purity, was the most powerful against evil according to ancient beliefs. Emeralds, representing hope, were believed to be good for eyes and would fade if love between lovers faded. Pearls were thought to bring tears to marriage but were fortunate for those born under water signs.