According to Wikipedia, Amethyst is a violet variety of quartz often used in jewelry. The name comes from the Ancient Greek a- ("not") and methustos ("intoxicated"), a reference to the belief that the stone protected its owner from drunkenness; the ancient Greeks and Romans wore amethyst and made drinking vessels of it in the belief that it would prevent intoxication.
Synthetic amethyst is made to imitate the best quality amethyst. Its chemical and physical properties are so similar to that of natural amethyst that it can not be differentiated with absolute certainty without advanced gemological testing (which is often cost-prohibitive).
Amethyst is supposed to magnify psychic ability, helps to strengthens immunity and relieve headaches. It is a symbol of sincerity, security and peace of mind.
Birthstone: February, Aquarius (Water Bearer): Jan. 21-Feb. 18, Wedding anniversary: 4th and 6th year