"Terri's wedding and engagement rings so he could use them to make some jewelry for himself." It's not really that bizarre. Terri probably wasn't allowed to wear them at the rehabs and nursing homes, even if they still fit. They don't have any children to inherit the set.
I hear it was a ring for himself. I suppose he could have her buried in them but I don't know any one who would bury diamonds no matter how sentimental. Or he could have sold them to help pay expenses.
see my post 2015.
Speaking of being buried with diamonds. If she was being cremated, it isn't like she would still HAVE the rings with her.