The last ring that I could find on EBay sold for $450 with postage so this pricing is pretty much dead on as you get the complete set as well which is a great break
http://www.ebay.com/itm/TOPPS-DIAMON...item25a2dc1f43
And this is a good example (card is sideways) about what the cards look like
http://www.ebay.com/itm/2011-Topps-D...item540e6c9001
As you see the ring by itself sold at $450 by itself so let's go to $500 OBO for the pair
As an FYI, I live five minutes from Leon so if you want to have him as a middle man for protection purposes, that is perfectly fine by me.
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Regards
Rich