7 1/2 inches chain necklace 925 silver, black cabochon round stone

Pendant: The pendant is a circular, metal piece with a central, cabochon-cut black stone. The metal border around the stone features a repeating geometric pattern that resembles the Greek key or meander pattern. Chain: The chain is a snake chain or a similar, tightly-linked, flexible style. Colour: The metal is 925 silver. The black stone could be onyx, obsidian, or another dark gem . Style: The Greek key pattern suggests a style inspired by ancient Greek or Roman design. This is a common motif in jewelry. Material: both the chain and pendant carry the mark 925, see pics. Age: The style is classic and has been used for many years, so it's difficult to date it from the photo alone. It could be a vintage piece or a more modern reproduction. The chain is a 7 1/2 inches doubled around te neck