Hi jerryo,
Ebay is most likely going to give you maximum exposure to a market, but as to whether you would get your asking price, who can tell unfortunately.
The biggest thing with ebay is you would need to calculate the listing fee, as well as the success fee in the event of a sale, ad those prices along with PayPal's take to your asking if those prices you have quoted are set in concrete.
Once you had that figure you could either list them at a Buy It Now price or on auction at a starting price that reflects the total figure required.
You may also consider talking to a specialist jeweller regarding selling them on commission for you if a sale wasn't required urgently.