Unfortunately, misrepresentation is prevelant on eBay, both by experienced and inexperiences sellers as well.
Here is how to protect yourself when buying on eBay:
1. Read the descriptions thoroughly, and understand them.
2. Look at the photos closely. Is the photo of the actual item you are purchasing? If not sure, ask the seller.
3. Read the sellers feedback.
4. Pay via PayPal, and understand PayPal's buyer protection rules.
5. Save a copy of the auction page.
6. Save your invoice receipt.
7. When the item arrives, inspect it against the description and photographs.
8. If the item is not as described, immediately email the seller and ask for a complete refund, including shipping and return shipping, and instructions on how to return. Save all emails.
9. If the seller does not cooperate, contact PayPal and eBay advising them the item was not as described. Take good, clear photographs of the item received and submit this along with all documents and emails you have collected.
If it is proven that the item is not as described, PayPal will charge back the seller for the item.
10. Better yet, do not buy pearls on eBay.
Bill