This is a lovely vintage pendant necklace set with an oval blue chalcedony cabochon in 800 silver (a lower grade of silver than sterling). The stone is suspended from a pretty filigree station with two faux pearls on either side. It fastens with a spring ring catch. This beautiful necklace dates to the early part of the 20th century and is most likely European in origin.
The necklace measures 18 inches and the pendant portion is about 1 1/4 inches by 1/2 inch.