This piece is convertible, and can be worn three ways.  Everything is bead embroidered, and features millions of years of Earth's history.  Ammonites, septarian nodule, and fossilized dinosaur bone are the key features of this piece.  
 
There are two pieces to the ensemble:  the front piece contains three Ammonites, a Stegadon bone, a Septarian nodule round, and a fossilized dinosaur bone drop.  The back piece features another four Ammonites, and is detachable so you may wear this piece with both the front and back, just the front, or use the back piece as a necklace by itself.