Amethyst is one of the most beloved and popular stones of all time. Amethyst is also the birthstone for February. It is a purple variety of quartz and can form with other forms of quartz, like citrine, and smoky quartz, as well as forming as "banded amethyst", which is a combination of amethyst, smoky quartz, and milky quartz. Amethyst can also have a variety of interesting inclusions that create a value added energy.
It is traditionally known for royalty, spirituality, wisdom, protection, and sobriety. It corresponds to the crown chakra (top of your head where your soft spot used to be as an infant) and can be used to stimulate deeper connection to the spiritual realm, create an aura of peacefulness, as well as shielding a sensitive person from harsher, unwanted energies. It is especially lovely for children and makes an excellent stone to aid sweet dreams and meditation.
Amethyst plays well with:
All quartz (citrine, rose quartz, smoky quartz, clear quartz, any exotic quartz or quartz with inclusions)
Other purple gemstones (charoite, sugilite, and purple fluorite)
Clear or white stones (selenite, scolecite)
Dark blue or light blue stones (lapis, azurite, kyanite, blue lace agate, angelite, celestite, turquoise)
Pink and green stones (rose quartz, epidote, serephinite, emerald)