I’d be glad to hand the ring over, very sensible not wanting to waste ridiculous sums of money on an overpriced new one, plus the sentimental value for him. Just because the fiancée seems a bit distant, it’s not necessarily that she’s aloof, maybe just a bit overawed or shy. I was terrible with my new parents in law for years, always was with the father in law, but after several years my mother in law became one of my dearest friends and far more important to me than my own mother ever was. Unfortunately she now has advanced dementia, but I still visit her regularly and she still knows me, I will miss her dreadfully when she is gone. Give it chance, it takes a long time to build a good relationship.