I love opals! They have such a dream-like quality when not overpowered by excessive gold settings. They remind me of where the sea laps the shore, and of the refracted light as the waves break onto the sand.
Whether or not an empty wine bottle is transparent, it can make a great bottle light! Mark where you want the holes to be with some masking tape, drill, rinse the bottle, then stuff Christmas lights through the holes you drilled. (via Wit and Whistle)