Fancy antique sterling silver ring marked “sterling.”  The ring has a large 17mm black stone that is rounded in sort of a rectangular dome shape.  The ring has prong set marcasites and one marcasite looks cracked.  This is not seen with the naked eye but under a glass.  All the rest are nice.  

The crown is 30mm high and has some open work.  The backside of the ring has some Greek key symbols.  The ring is size 4.75 or 5.  It measures 4.75 on my ring sizer but fits my pinky which is size 5.  Nice condition.  The ring has not been polished and does have patina.  5.02 grams.