|("Katya" by Handmaden Designs)|
|("Boxchain bracelet" by Handmaden Designs)|
Onyx is a Chalcedony that has fairly parallel bands of colour. Black Onyx, is actually not Onyx but Chalcedony or Agate that has been dyed black to make its colour uniform. Black Onyx is a very popular gemstone in jewelry and is often used in the form of beads or cabochons. The value of Black Onyx can be anywhere between $1-$30 a piece or as high as $100 for sandblasted pieces.