Antique Sterling Art Glass Brooch

This brooch is exquisite. It measures 2” x 1.5”. It is marked Sterling very tiny on the edge. It has a C clasp with “Hold On” clasp. The clasp is patented with 13009, which was patented in 1855, and C clasps were popular before the turn of the century. The glass center cabochon has so much character. You can see how the blue, red, and olive glass was melted together. No flaws. B2