Okay, I'm racking my brain right now, but can't seem to come up with anything. This might be surprising to people because I've always had a lot of stuff, and throwing things away can be hard for me. I think that's a bad habit that I'm growing out of. Trench and I got rid of a lot when we moved (turns out that's the best way to de-clutter...move out!). So I'm trying to think of the one precious item that I can't live without. Books? Music? My wedding ring is the easy answer, but it was my grandmother's setting, and believe it or not, she had a backup. The stone is an amethyst, which is precious to me, but I didn't exactly need to take an insurance policy out on it. Maybe I'll switch to a diamond after I'm forty, because according to Holly GoLightly, I'm too young for diamonds until then.
I think the item(s) that would hit me hardest if I lost it in a fire would be my journals. For years I kept paper journals in composition books. I tried having one for every year, which worked when I was in school, but after school they started blending together. I remember trying to find one for a specific period of time last year, and couldn't find it anywhere. I was really distraught about it, it was like losing an entire two years of my life. I found it when we were moving, right with all the others as if it had been there all along, even though I scoured them all multiple times looking for it.
Lately I've switched to an online journal (besides this one...it's out there, but no one can access it but me). After thinking I lost that one journal, I didn't trust paper anymore. If there's ever a house fire, the internet will keep my current journal safe, although it's the paper journals that mean more.