If you need an insurance policy for an engagement ring as I did (or any jewelry for that matter), I have to recommend Jeweler's Mutual. The online application took about 5 minutes (using a Flex app, no less :) ), after which I uploaded a scan of my jeweler's appraisal.

Afterward, I called to make sure they had everything and they confirmed that I was covered over the phone. So all in all, I had a full policy in about ten minutes, and I saved about 25% over adding the ring to my homeowner's policy. Pretty cool.