Black Opal Pendants - A Jewelry Piece With Shimmering Sheen Genuine gemstone Black Opal has a bright appearance and a shimmering sheen. Opals are the birthstone for October newborns. Taurus and Librans may wear black opal jewelry to benefit from its benefits. However, individuals of other zodiac signs may also wear this beautiful crystal. Unquestionably, black opal reigns supreme above other opals because it is unique, authentic, and has a stunning play of color. It is one of the most beautiful stones one could ever own. Due to the prevalence of fake opals, finding authentic black opals is difficult.