This creation by Hunnisucklebeads is called "Crystal"

It is made up with round black onyx gemstones which are seperated with teal coloured hand cut crystal rondelles.
The necklace is finished with hammered silver discs with faux suede cord leading to a sterling silver lobster clasp.
The necklace measures a maximum of approximately 17 inches
( 43 cm ).

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