Necklace Jet and Jade Opal

In this piece (from top to bottom):

One antique metal button, circa 1880-1918, chosen from our collection
Jet and jade opal lampworked and pressed glass cabochon from mid-century Czechoslovakia.
Jade green lampworked Czech glass bead
Stamped brass floral bead cap, made today in the USA with antique dies
Antiqued brass chain
Chain adjusts from a 15" choker to 32" long pendant with sliding clasp