This is why it's so difficult for a non-jewelry seller or the person who wants to sell a ring from a 'no way' relationship on eBay.
Your photo doesn't really show us the item. You have listed much, much less than enough information to sell this ring - even if $350 is $ 0.10 on the dollar of the original purchase price!
What is the K (gold purity Karat weight) of the ring? Do you have the grading/certification/appraisal documentation report on this ring? What is the color of the main and secondary diamonds? What is the clarity? etc., etc., etc.
A buyer can't know if they are getting a 'deal' or a 'lemon' without more details.
Suggest you think in terms of the buyer. If you were the buyer, what would you need to know? want to know? before you sent your money to an unknown person for something that is more than the value of the cash in your billfold? Would you do it? Or not? Why?
Look at other listings for similar items. If you don't have the documentation, you might get more $ after paying for the appraisal in writing (GIA certified gemologist) and paying someone to take quality photos of the ring.
Personally, I'd rather buy something that I can see in person OR trust because of the certified appraisal from the GIA so I won't be disappointed.
I think it is very pretty and hope you sell it. Inless you have the money to buy a really good camera that takes real close up your pictures will look like this. I have been having problems with my pictures and want a new camera. Of course i don;'t have the money right now. Good luck. Amy