Unsigned most likely American made. Rhodium plated filigree with imitation lapis that is carved with a floral motif. The center drop has tiny imitation pearls that frame the carved glass with a blue enamel background behind the imitation pearls. The clasp is a push in box style that is secure. A beautiful Deco era necklace.
The necklace is 15 1/2" around. The center is 2 1/8" long. Weighs 11.8 grams.