My PC. It's not a beefy system by any means... it only has an i3 8100, a 1060 6GB, and 16 GB RAM, all bought for about $600 in 2018, but since then this has been generally the best thing that's ever happened to me coming from a low-income household. My family lost a lot of financial and emotional stability over the past few decades so as a person growing up I always felt like I was going to stumble. Thankfully this little big thing has provided that stability for me as a troubled individual. As I get older it's allowed me to catch up on my traumas and build my own life out of it on my terms. It may not see use forever, but some part of it (no pun intended) will always be a part of my life.
My and my wife's rings. We've given ourselves to each other so much and while it was always a given that we would spend the rest of our lives together, it unexpectedly strengthened these feelings when we made it official. We're each other's pillars.