I think also that some people really don't approve of expensive jewelry, as opposed to being jealous of it.
Haven't we all heard people who believe nice jewelry is wasteful, useless, self-indulgent etc. And in that case, it's much better that they do keep their pie hole shut, right? LOL.
I meet a lot of those negative people in this weirdazz small town that I currently reside in. Women here get a .25ct or .33ct and a .5ct is considered "big" for an e-ring. And they wear those original rings for-ev-er, for life, with no upgrades. One small town woman even commented to me that women who get more than a .5ct diamond for an e-ring are "spolied." I wear a .8ct that I got at a pawn shop as my around-town / work ring, soley because my Pricescope diamond collection is so far out of the local league. Around here, even the women seem to think that women are to ask for and have exactly nothing for themselves, and are to spend all their lives sacrificing themselves for others.