Raw black Herkimer diamond, medium size.  Absolultely whimsical to behold!!!  The diamond has a couple small clusters on it, such character.  The sterling silver ring it is set on is sizeable which is fantastic for a couple reasons:  you can wear it on different fingers if you chose or adjust if your fingers tend to swell at times.  Having said that, the silver is soft and posable and I don't recommmend too many changes to the shape.