You wouldn't buy a used car for the original retail price, right? Same rule should apply to copping vintage jewelry. If you want to get the most bang for your buck, you've got to pay attention to the condition of the piece. Extremely worn plating, missing parts, and chipped or scratched enamel lower the value of the piece. So don't be quick to pull out your credit card for a Chanel chain just because it's Chanel. Besides, your girl won't think you're stunting if you've got a rusty chain.