This creation by Hunnisucklebeads is called "Black Onyx Beauty"

It is made up of faceted chunks of black onyx gemstones with rectangular rock crystal gemstones beads. Each of the main beads are
seperated with hand cut crystal rondelles.
The necklace is finished with a faux suede cord.
The necklace measures a maximum of approximately 26 inches
( 66 cm ).

Here is a close up of the necklace showing more of the detail.