Birthstones are based upon the zodiac signs. Each month of the year has a specific gemstone associated with it that is considered the "birthstone" for that month. It is believed that wearing stones that correspond with one's birth month increases one's inner strength. It is also believed that certain stones have their own unique "powers." For example, wearing garnet is said to help ease the pain of a bad breakup, or cause jealousy between lovers. Amethyst is said to protect its wearer against the ill effects of alcohol, slow down intoxication and prevent hangovers. Turquoise is said to give emotional strength. Jade has always had enormous importance in Asian civilization; it is said to have the mystical power to protect its wearer against nightmares and other psychic attacks etc. Examples of such birthstones are Garnet (January), Amethyst (February), Aquamarine (March), Pearl (June), Peridot (August), Citrine (November) etc. The beauty of these birthstones consists of its color or colorlessness, brilliancy or softness of luster, and transparency.