This classical necklace is made out of fused fine silver rings that are hand formed into their final shape as the chain is made.  
The boro beads are integral to the necklace, the rings that the beads are on are also fused fine silver and have to be placed as the necklace is made, not added in after the chain is complete.  
The entire chain is fused fine silver except for the toggle clasp and the makers tag (with my initials "PO").  The necklace is 19 1\/2" long and the chain is 3/16" on a side.