Hmm...
It could be my Bloody Gem necklace, the first ever blue I had. I hadn't even realized that it was a blue until much later. I was gonna NPC it, but then because I was in a romantic mood, equipped it because it matched my guild's name, Blood Drunk. When I realized it was a blue, yeah, I choked and was glad that I had equipped it.
It could also be my +9 lvl 30 1h sword, which is the first +9 I've ever owned all by myself, which I bought for my little fighter. Or maybe the +9 lvl 50 fighter shield... when +9 fighter shields are rare and cost 2G more than I bought it for.
I can't imagine ever having a gem, nevermind 17... For me, 25G is a lot. But eventually I'm gonna have to pay that if I want to buy lvl 7x/8x +9s...