I agree with Sandra. I'm certain there are very reputable jewelers on-line who will provide the item as described at considerable savings. However, will this item be the one that suits you best? What is their return policy? Selecting a ring and then having to return it will eat up some time, as well as placing a hold on that money until the refund is processed. Normally shipping charges are not refundable, so you may be out that cost, as well as the time.
The internet is an oustanding shopping reference for information on styles, cuts, quality, and bands. But most of us need to try it on to see how it both looks and feels. I have short skinny fingers. Fortunately, my fiancee went through my rings and decided on a marquise cut, as I already had several rings with that cut of stone. His proposal was not totally unexpected, but it was a surprise. I was so pleased he had the foresight to discern my preferences and pick something that would look good on my hand.
For our wedding rings, we wanted something inexpensive and unique. Being an avid recycler, it didn't matter if the rings were not new. I ended up with an antique band in white gold with diamonds set in a filigree pattern and banded with yellow gold. It was from a pawn shop of all places. After our wedding, I had several clients ask who had made that ring for me. It suited my hand that well.
If your budget is a determining factor, check out your local pawn shops, or those in nearby towns. They generally have a large variety and will be able to size or refer you for sizing at little or no additional cost. The only things you'll be sacrificing are the jewlery store mark-up and the gemologist certificate for the stone. Once a ring is properly cleaned and polished, it's very hard to tell it's not new.
Several years later, I was quite pleased to learn my wedding band was actually worth about 4 times what we paid. For me, the value of the ring is irrelevant. It was my ring, I knew it when I first saw it. The sales clerk warned it could not be sized as she took it out the display case. I was not concerned, I knew it would fit perfectly, and it did.
Good luck on finding the perfect ring for you.