I paid $12.72 for this item. It's worth that much as a replica piece for an authentic look for a Jack Sparrow costume. It's a bit small for an adult male. I think it about a size 9. I will have to cut it and spread it to fit over my thumb. Yes, this is Sparrow's thumb ring.
I also bought the "Stolen Ring" and another replica ring that Sparrow uses in the movies. I do the Sparrow character for charities and educational events, so it was worth buying these items as I will get multiple uses out if them.
  These are NOT collectibles, they are costume pieces. But do serve the purpose