<human>: Summarize the given text in a few sentences.

We've been together for 6 years, and I've been planning on proposing for the last 2, but was waiting for us both to mature a little more as I've always felt we needed to close the maturity gap a little more before tying the knot.

So I finally pulled the trigger. I had a custom engagement ring made using a sizely heirloom diamond from my late grandmother, with gold and additional diamonds from close family members. I spent way more than I should have, at about 3 months worth of paychecks on top of the re-used materials to have this ridiculously overpriced finger rock mount created.

We flew out to San Francisco over the last weekend, hiked out to a mountaintop in Marin to watch the sun rise over the city, I proposed, and she said yes. It was a great weekend, and we flew back on Sunday.

Within 24 hours of being back home, she has completely lost the ring with no memory of where she left it. I just took the entire day off work to help her tear the house apart looking for it (thinking we'd find it quickly) and it is nowhere to be found.

She feels like shit, and I am doing my best to tell her it will be ok, and it might still turn up, and it's only a symbol/material-thing, but deep down I can't help but feel regret and resentment. Shouldn't I though? I am not looking forward to having to tell my mom about her dead mother's missing heirloom, and I am ignoring all of the congratulatory calls/messages I'm receiving because I am dreading the subject of the ring will come up.

I have never felt this sick before from the loss of a material item, but this thing represents a huge leap of trust and vulnerability for me, as well as a substantial amount of work and capital, and I'm just having trouble moving forward.

I suppose the relationship is what's important, but when you've just gone out on a limb and committed to spending your life with someone, resentment and regret are the last two emotions you want to be feeling, even if off-point.

Any advice or support would go a long way. FML
<bot>: Spent way too much time and money to purchase rocks. Presented rocks to potential mate. Lost rocks. Am sad monkey.