Onyx is a semi-precious gemstone that is a banded variety of Chalcedony mineral. Black is the most popular onyx gemstone color however the gem exists in almost all colors. Onyx stone is typically opaque thus is often available as cabochons, however faceted and carved gems are also available. A cabochon black onyx gemstone for your Onyx ring or a faceted heart shaped onyx for your pendant, we have hand-picked loose onyx stones for all your jewelry needs.
