This small bottle with a cork charm is really unusual. It can be used to hold any tiny momento or treasure. It has a loop on top so that you can where it on a chain. I would recommend gluing the cork in the bottle though once you have your treasure in it so that it does not come loose if you where it on a chain. You could put sand from your favorite beach, tiny shells or rocks, a love note, baby teeth, and many many other things that you might think of. The metal loop on top is not sterling, but a silver base metal. This round bubble bottle is 36 mm long with the loop and 17 mm in diameter at the bubble. Look for the other shape in my store that is more cylindrical.