The listing, Silver & Pearl Charm has ended.
The teeny-tiny stamp on the side that I couldn't get with my camera say "ster" so I am assuming that it it sterling silver. Every year when the fair comes to town, my mom used to take us when we were kids. This was what we got one year after we were able to pick out an oyster and found that there were two pearls inside. So, the pearls were set into the setting and set on a chain. The chain is long gone, the diamond is fake, and the charm should be sterling silver. It's a very pretty piece and probably could be polished up bright and shiny.