Spiritually, amethyst symbolizes calmness, spiritual protection, and wisdom. Its purple color is associated with the crown chakra, which connects to higher consciousness, intuition, and spiritual awareness. Ancient beliefs linked it to sobriety and clarity, and today it is used to promote inner peace, aid in meditation, and foster spiritual growth. 
Amethyst is the traditional birthstone for February and is particularly well-suited for Aquarius and Pisces. Because of its calming and spiritual properties, it also benefits Capricorn and can aid other signs like Aries and Virgo. While some signs are more strongly aligned, amethyst is generally considered a universal gemstone that can benefit most people.