Black and Blue Onyx are a form of chalcedony, which is a variety of quartz. Both Black and Blue Onyx is believed to provide strength to the wearer as it reduces mental, physical and emotional stress.
Black onyx or black agate is most commonly recognized as a solid black stone although it will often be mixed with white lines or banding running through it.
Blue Onyx is a natural gemstone. A type of layered chalcedony, this stunning stone boasts soothing shades of blue. This stone is also known as “Paraiba Onyx”, after the unique area where it is found.