This is a gorgeous vintage Art Deco vase with sterling silver overlay. It is black glass, often called black amethyst because it is actually a very deep shade of purple. The vase has a beautifully detailed design in silver that is repeated on both sides. The design features an urn, wreaths of flowers, and arabesques. It is marked with the word Sterling in silver overlay. I have not been able to identify a maker for this vase, but I think it is most likely either English or Bohemian.
The vase is 10 inches tall and 3 1/2 inches across the base. It is in excellent condition. There is some wear to the silver overlay around the rim, and the expected amount of shelf wear to the bottom.