This thread...
http://www.disboards.com/showthread.php?t=1520941
should answer most questions you have and will also show you many of the settings they have. The cost with tax for an oyster from the tank is about $17 with the tax....it might even be $17 exactly. The settings vary in price from very simple and inexpensive to ones that are higher priced with diamonds in the settings. It is much much much cheaper for settings at Epcot's pavillion than at DTD where the Pearl Factory has a kiosk.
Page 100 of that thread has a number of photos on it or if you search under my posts, you can see some of the items I have. I love them all!