It is a semi-precious stone with a minute crystalline structure that has distinctive bands throughout. These bands result from impurities that seeped into the rock as it formed and can be almost any color. The stone has a milky appearance and is translucent to transparent. It is an exotic natural stone that exudes beauty and is most stunning when back or underlit.
Onyx is a softer stone than granite. It can be scratched and etch. It is typically used for fireplaces, bars, vanities, islands and specialty wall and flooring.
If you are looking for a wow factor, onyx is your choice. With some backlighting, it will add class and sophistication to your room. It will require some care and maintenance to stay beautiful.