I think I had this same ring..or person..attempt to commit a fraud today, I am selling a diamond ring on Ebay..he wanted me to ship the ring first..then accept money into this escrow holdings account on the website. I specifically stated in the Ebay add PayPal only..but..that did not stop him from attempting to commit the fraud. Lucky for me, I have experience..from working in law enforcement..and I knew right away..that something was not right..his user ID today on Ebay was "nuibfadess"...then he circumvented Ebay and started sending Emails to my Email account trying to pressure me into the sale. I told him too bad..PayPal only..or nothing..finally he stopped writing to me when I informed him that I was reporting him to Ebay and that I realized he was not a legitimate buyer and a possible criminal.
My advise to all victims..you can report this to your local law enforcement agency..most agencies have Criminal Investigation Divisions which cover internet crime/fraud. You probably won't get your money back unless you can talk to your Insurance companies and see if your loss is covered under your homeowners or renters policies and the item is covered. It does not hurt to call and ask about it.
And again..if they don't want to use PayPal..don't make the sale..it's not worth the loss. Thanks!