A favorite among the black gemstones, black onyx is both a fashionable and affordable option for many jewelry lovers. Much like a black dress, black onyx jewelry is considered a fashion essential. Its color and smooth, waxy luster make this gemstone very unique and desirable. Here are some interesting facts about black onyx: 

• Even though black onyx is not a designated birthstone for any month, it has been associated with the Zodiac sign Leo.
• Onyx is a variety of chalcedony, a member of the quartz mineral group. It is formed by the deposition of silica in gas cavities found in lava.
• Black onyx is considered a protector and is said to guard against any evil. It is believed to drive away negativity and enhance determination. Some people even believe that wearing black onyx will help heal any skin problems.
• Natural black onyx is very rare. Because of this, most of the black onyx found commercially has been dyed with a cobalt solution.
• Onyx is the designated gemstone for the 7^th wedding anniversary.
• With a hardness rating of 7, black onyx is a relatively hard gemstone, but may be prone to scratches if worn a lot. If this happens, apply jewelry polish to the gemstone with a soft cloth, rinse with water, and let it dry. Olive oil can be used to seal the stone and protect it from any more scratches.
• Black onyx deposits can be found in Brazil, Argentina, India, Madagascar, California, and Uruguay.
• Its name comes from the Greek word “onux,” which means fingernail. According to Roman legend, the goddess Venus was resting on the bank of the river Indus when Cupid came along and started clipping her nails, causing the scraps to fall into the river. In order to immortalize the remains of this goddess, the nails were converted to stones and were henceforth known as onyx.