This lovely necklace is all glass. The chain has very interesting elongated beads in blue and clear crystal. The center is composed of delightful blue beads with a clear crystal briolette between each one. Necklace is Czech but unmarked. They were known for their very fine glass beads for many decades. Necklace is 16 1/2" long and about 5/8" wide at the center front. It has a barrel clasp and is in excellent condition. You can see that the metal links are no longer shiny. This is due to its age and use but does not detract from the intrinsic beauty of this beautiful vintage necklace.