Slow down, what is the Balfour Olympic pin, Tiffany piece and it's makeup? Throw some pictures on here if you could. I want to make sure you're getting at least the same value as the original deal. This may be a better deal using some barter items or it could be that you're bartering out some good profit. I am not a fossil guy unless it's a watch or something but pics of the items you are putting in the deal will help.
If this seller is a dealer, buyer/reseller, please let us help you so you don't get the lesser end of this. We haven't seen pics of the exact item you are planning on buying and you are bartering some premium items.
The reason I say all this is that "old ladies" looking to sell their old sterling are not particularly looking for anything in trade but cold, hard, cash.