135CTS Black onyx plain tube beads.
Onyx primarily refers to the parallel banded variety of chalcedony, a silicate mineral. Agate and onyx are both varieties of layered chalcedony that differ only in the form of the bands: agate has curved bands and onyx has parallel bands. The colors of its bands range from black to almost every color.
This set of 10 beads are wire strung and each bead is approximately 14x9mm in size.
Origin : India