Vintage Marbled Green Porphyry Glass Set Adjustable Size Ring

Formed from brass metal set to the front with a circular shaped  marbled porphyry art glass set central piece, with a plain double banded design . The ring has an lightly adjustable size band. Circa 1960's - 70's

• Adjustable size band.
• Unsigned but attributed to being manufactured in Western Germany 
• Center piece measures approx 1.7cm by 1.7cm
• Circa 1960's - 70's
• Good vintage condition