Most of my friends have quite expensive rings and nobody I know is divorced (yet). They are nearly all from families with no divorced parents certainly but also relatives, so I suspect that impacts the likelihood of divorce too. Both DH and I are far more likely based on character and upbringing, to slog it out rather than divorce, even if unhappy (which thankfully so far we’re not) but between us, our siblings, our parents and aunts and uncles (14 couples) only one couple is separated. So in our families, marriage is really expected to last. I don’t think that is the same for every family and peoples attitude entering marriage reflects that.