Art Deco filigree Blue topaz vintage sterling silver bar pin brooch. Good used condition with little signs of normal wear. Beautiful silver filigree open work design. The middle is a light blue round faceted topaz. Stamped on the rim Sterling with an unidentified hallmark. Clasp has an additional safety catch. 

Acid tests positive for sterling silver. 

Gemstones tested with Presidium II Gemstone tester. 

Brooch measures 1/2 of an inch tall and 1 and 1/2 of an inch wide.