Onyx is considered a Upratna for Emerald. Although it is generally opaque, it is highly popular due to its luster and influence. Individuals whose birth chart features a beneficial yet weak Mercury should certainly wear Onyx. It enhances eloquence and sharpens decision-making abilities, while also proving beneficial for business. Some experts believe that those frequently affected by the evil eye (Nazar dosh) can also benefit from wearing Onyx. It is also worn to help treat skin related ailments. Individuals with Gemini or Virgo as their Ascendant (Lagna) or Zodiac sign (Rashi) should definitely wear Onyx.