Aquarius' astrological gem is the AMETHYST.

Amethyst is the beautiful purple precious stone. This naturally occuring gemstone is a form of quartz crystal. Its primary ingredient is sand.

Just like Aquarius, amethyst is deeply and uniquely spiritual. It is said to be one of the best stones to use for meditation. Symbolizing divine love and global awareness, the amethyst guides the awareness away from self-centered thought patterns, as it lures the mind towards a deeper understanding.

When Aquarians wear amethyst, they experience its calming mental effect quite strongly. It is a known remedy for over-stress and overwhelming emotions, and can help to treat migraine headaches. It's good for Aquarians who tend to be easily angered or suffer from recurrent nightmares, because it promotes mental peace and harmony.

The amethyst is also believed to give protection to those who wear it.

Amethysts in Legend:
In ancient Greece, the amethyst was thought to preserve clarity of mind. Leonardo Da Vinci wrote that the amethyst dissipated evil thoughts and quickened intelligence. Amethysts are abundant in the British Crown Jewels, and partly for this reason, the color purple has come to symbolize royalty. Because the amethyst was believed to promote piety and celibacy in the Middle Ages, it was a popular ornamentation for religious purposes in this era of history.