I do think things should be questioned. But if people do their research, look at all their options and their overall financial situation, and still want a diamond ring, I'm not going to judge them. OK, maybe I'll judge them if they made a financially foolish decision like a really expensive ring they couldn't afford or put on credit. But not if they bought something within their means and got value out of it. People vary in what they value. Some people (most guys, a lot of women) are not into jewelry. Some are.
You might have me confused with someone else. While I am getting a divorce, I consider my MIL part of my family and love her. And while I no longer have the ring that was associated with bad memories, I did keep a ring that my ex bought for me a long time ago. He sold a piece of artwork and rather than putting it in the budget, surprised me by getting me a handmade ring. That ring IS associated with good memories and I intend on passing it down to one of my daughters.
Regarding conflict diamonds, when she got her ring highly doubtful. And really for anyone who purchases a diamond after 2004, particularly one with a grading certificate. Is it perfect? No. But if I was morally perfect I wouldn't buy food grown in the Amazon basin, or put gas in my car, or electronics using gold which is also used to fund conflicts.