Black Onyx is the gemstone which is Birthstone jewelry for the zodiac sign of Leo and Capricorn. It is one of the most classy and mesmerising pieces of Gemstone today. It has got pure black colour which gives a very stylish appearance to the wearer. Black Onyx Jewelry is popular equally amongst both men and women and makes them look majestic and classy. However Black Onyx Rings are amongst the best sellers in the market and also uplifts the thinking level of a person and helps them to grow exponentially.