Based on Early Italian Renaissance Artwork. 

Strand is made up of Blue Adventurine (dyed) beads.  The drop consists of a Blue Agate cabochon in a brass setting on a Gold-plated Brass plaque, finished with 3 teardrops of White Agate.  Center drop has a grey stripe across the top.

Toggle Clasp.  Strand is 18", and the drop is 2 3/4".