This is an antique ring - a great collectors item. 
One gemstone is missing - see photos. 
Size is unknown, but could be between N 1/2 - P 
It is stamped silver, with a gold-plated overlay (which has since deteriorated over time around the band - see photos for imperfections).
Weight: 12g 
Please browse through the photos uploaded and feel free to ask any questions. 

Offers more than welcome.