I'm very sorry this happened, I would be just as upset and I do hope UPS gets right on this for you. I'm so glad you purchased insurance! I kind of want to point out that the ring wasn't necessarily stolen - I deal with UPS on a daily basis and have seen some VERY mangled packages - it's a result of the handling rather than anyone actually opening it. The ring could have easily fallen out. But then I happened to look at the information on the tracking number in your letter. I don't know if you're even aware of this, but as a "reference number", which is printed right on the package label, UPS has "ENGAGEMENT RING FOR RESIZING". Yes - that was printed on the outer label of your package. Which makes me suspect that you're probably right and it WAS stolen. I don't know if you entered that as a reference or UPS did, but if they did that, then I think that adds to your case against them significantly.

Good luck, and very sorry about this.