I have sold costume AND fine Jewelry on Ebay.  In MY EXPERIENCE, it seems that the costume jewelry tends to sell better than fine jewelry.  It could be because of all the potential scams out there effecting us honest sellers, or simply because there are a lot of costume jewelry collectors.

When listing jewelry, you MUST BE SPECIFIC!! List any and all flaws!!

When buying jewelry..ASK ASK ASK ASK TONS of questions...(if the answers are not in the description) . Ask for certifiaction papers on the item in question...ask for detailed photos...Close ups..not just one picture of the entire lot...close ups can determine if the lot is a bunch of cracker jack jewelry , or GOOD authentic jewelry....

Keep an eye out for my auctions and feel free to ask me any questions you wish.

I am a certified trading assistant and would love to help you buy or sell an item.  I even will list your item for you so you don't have to worry about all the problems associated with selling...(it's a headache..but it's also fun at times!)

Good Luck

Tara