December BIRTHSTONE MEANING & HISTORY Zircon gemstone is regarded as December month birthstone and can also be worn for healing and jewelers’ purposes. During the Middle Ages, this December birthstone was thought to lull one into a deep sleep and scare off evil spirits. In the Hindu religion, zircon alternates with hessonite garnet as one of the nine gems of the navaratna. When worn together, the nine gems protect the wearer and bring wealth, wisdom and good health. Victorians had a fondness for blue zircon. Fine specimens can be found in English estate jewelry from the 1880s.