The Fire Opal cabouchon is set in fine silver on an oxidised and layered Sterling silver hollow box. The necklace is made up of faceted Rutile Quartz  ( Quartz with shards of black Tourmaline inside. )  and handmade Sterling silver beads with a handmade silver catch.
 
Necklace length is 17 1/2", can be made a touch longer or shorter within the price.
Centrepiece is 23mm diameter.