Birthstones are gemstones that are associated with a birth month or zodiac sign and each one has a unique meaning. Birthstones dates back to ancient times. They were popular and were believed to hold incredible powers such as luck, health and prosperity. Traditionally, each month is associated with a single gemstone, but in modern times gemstones have been added so there are now multiple birthstones for each month or zodiac sign. As you will see in the chart below. Click on the gemstone name to find out more about it.