This is a vintage pendant necklace.  The necklace is set on silver tone cable chain.  It has a central pendant which is round shaped with an enamel design with some wear to the enamel.  

It has a spring ring clasp. 

It is secondhand with some signs of wear/tarnishing.  

The necklace is approximately 56 cm in circumference, excluding the extender.

The pendant is approximately 3.5 cm in length.