2004 grand am front seat removal?
The easy way would be to take a flash light and shine it around and see if you can locate it. If you can spot it in between the seat and the arm rest, go to your nearest parts store and ask for a "parts grabber" with the retracting claws. I don't know what it's really called but the auto parts guy should know what you mean. They also come in magnetic, but you want the one with the grabbing claws. If you find one, stick it down between the seats and simply get it with the claw.
Your best chance of locating it is to lean down to the rear drivers floorboard and look forward in the narrow space between the console and the inner seat rail. This is the most open view of the space the earring fell into. If you try looking down from above there is a lot of area you can't see. If you see it you may be able to push it forward with a stick or other long object, or pull it toward you with a back scratcher or long handled spoon.
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