.925 silver ring with an insert of silver made to look like a stone. In good shape.
The insert's surface is uneven and it catches the light in a nice way. The photos didn't capture that aspect very well as the light I use is very soft. 
There is some play with the insert and it makes noise when the ring moves. It's not loose, that's just how it was designed. If you find it bothersome, I think you can make a shim to place into the back of the insert on the inside of the ring. 
Inner diameter 18.4mm (size 8.5)
Weighs 18 grams.