Mid-Century Bal-Ron Gold Filled Opalite Necklace

1950's gold filled necklace is signed Bal-Ron 1/20 12K GF and features Opal glass and Rhinestones.  The chain measures 16 inches and the pendant measures 1 1/2 inches by 1 inch wide.  The necklace weighs 7.7 grams and it is in great condition.