Vintage Sterling Silver Ring with Lapis Lazuli Stone Size: 5 3/4

Vintage sterling silver ring with a deep blue stone. It is set with a blue lapis lazuli stone that has an unusual color pattern. I tested the white spot as lapis does not work with a gem tester and this is a natural stone. I wanted to be sure that it was not glass and it is not. 

Size: 5 3/4 Face measures 15mm in diameter. Weight: 3 grams. Very tarnished. Marked sterling inside.