They are an addiction of mine...
As you burn the soy candle (which smells great) a gold foil package is eventually revealed. You dig out the foil and unwrap a beautiful ring. The rings are worth anywhere from $10 - $5000.
I haven't had the time to take mine in to a jeweler to see how much they are worth - but finding the treasure, no matter the worth, is all the fun. If you happen to find an expensive ring, all the better!
These are some of the rings I've found: