People use Birthstones for various reasons. Some use this for luck, for energy, to stop negative vibrations. They like believing that wearing a birthstone brings them good luck and protects them.
Wearing the stone that coincides with your birth month is believed to help enhance your aura and energy levels. It can also help you to feel aligned with your soul purpose. When you wear your birthstone or use the stone in manifestation rituals or healing work, the stone is said to be amplified in power and far more effective.
Below are some references u can take into consideration:
January - Garnet
February - Amethyst
March - Aquamarine, Bloodstone
April - Diamond, Zircon
May - Emerald, Tourmaline, Chrysoprase
June - Pearl, Moonstone
July - Ruby, Carnelian
August - Peridot, Sardonyx
September - Sapphire, Lapis Lazuli
October - Opal
November - Topaz
December - Turquoise