I've just taken a look at the ring listing and what the member above has written rings very true to me.
The first thing I notice is the display pic, and to me it looks like a snap shot from bidz.com, makes the ring look cheap whether it is or not. I am no expert in jewellery sales on ebay, however the ring does seem very expensive, but there is no where near enough information for me to even attempt to make an informed decision on that.
My advice, check out your competition, see what the prices are. More pics, and higher quality pics, the one you are using doesn't show off the ring at all. Try not to use a white background image, you want something that looks real so the customer can relate to it.
Plenty more information, I would seriously doubt anyone ever loosing a sale because there is too much detail.......
Watch your shipping options, consider opening that area up to enable international bidders, and increase your chances of a sale.
It looks very much like a drop shipping set-up to me, and one where you may not be getting a good deal, on price or effective images.
The one thing you have to remember is that just because you list something, and you tick off all the squares while doing it, it still doesn't equate to an automatic sale!
It just gives you a better chance, but in this game you need all the advantage you can get!