Jade is listed as the Mystical birthstone for the month of March and the birthstone for the Sun Sign Virgo. See the birthstone tables for additional references to this stone. Jade may be given as a gem on the 12th 30th and 35th wedding anniversary.
Black is associated with mystery and the great unknown. It is believed that wearing black or grey stones in jewelry, or clothing, suppresses and protects the emotions while portraying the wearer as mysterious, sexy, and sophisticated.
Black is actually the absence of all color, but we commonly refer to it as a color and black is thought to banish and absorb negativity, it is symbolic of outer space and the universe. In some cultures, black represented fertility, in others it represented wisdom. It is often linked with evil or death because in many cultures, black is the color of mourning.