Comparing prices is important for two reasons: it's a great way to determine if a piece is fake and if you're being ripped off. Go to a few different websites and consignment stores to see how much they're selling the jewelry for. If it's the exact same piece, in the same condition, and the price seems too good to be true—we're talking a difference of at least a few hundred dollars—you're probably getting ripped off. You never know, you might even be able to haggle that sales associate into matching the price you saw at another shop.