If you have more rings for sale, please follow all the advice given in the replies.
Look at auctions and BINs (Buy It Now) for similar items, as a starting point on price and listing details.
Use a title that will be self-explanatory, but detailed e.g. 18ct white gold ring size K diamond
(so describe it simply but enough to get key words in and be accurate)
Which means, more potential bidders will look at the ring. Just "ring" could mean anything...
You should know, whether it is plated, solid (and what ct) rolled, filled, or electroplated, and what these terms mean.
What the stones are, if any.
The ring size. A good thing here is to place the ring on a ruler to photograph the inner/outer mm. That gives a comparison for people to check against one of their rings that fit. Then from doing that, you can find the nearest size letter (there are ring size guides on the net).
I look at a lot of rings, and just "ring"...I would not look at unless the picture was stunning.
Your best bet here is to apologise and request from the buyer, a cancellation of the first sale.
Sales are meant to be honoured...but here I can understand your being upset if it was worth 300$
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Buttercup: You mock my pain! Man in Black: Life is pain, Highness. Anyone who says differently is selling something.
