Large faceted Ethiopian opal faceted rondelle beads necklace

Large faceted Ethiopian opal faceted rondelle beads necklace 
The fire in this necklace made it really hard to photograph this one is stunning in real life!
18 inches long with an additional 1.5 inches of adjustable chaining 
Solid sterling silver findings lobster claw clasp.
A center rondelle of just over 8mm graduated to just over 4mm at the back