Astrological Benefits Of Opal Opal is one of the most astonishing crystals, and it is famous for its unique play of color, which makes it a preferred choice for jewelry. In addition to its beauty and distinctive effect, opals also possess numerous astrological benefits. Gemstone enthusiasts and astrologers believe that the person who wears this alluring crystal will have a positive influence on their lives, especially those individuals who are born under certain zodiac signs.