Mellors,
I have bought and sold gold rings on Ebay..many of them.
Go for it, I say!
I have been a longtime seller on Ebay with 100% positive feedback, selling my "artrox," which is also my user name there, and I've never had a bad selling experience. All the people there have been great buying my art.
My daughter had bad experiences selling her twin's baby clothes...to a lot of kooks and post-partum nuts. She doesn't go there much anymore as a result.
One just has to find the right niche.
Patty