i agree with you on this one. i honestly cannot understand why anybody would ask what the specs are (not on a forum, but in person). i mean, why would they care? everybody has different taste, therefore everybody will have different engagement rings. frankly, it's none of their business and i feel they only ask this to get an idea of what it costs.
Hey....I've had someone ask my DH what he's "having done" at a surgical clinic!!! Talk about "in-appropo"
Mind you, he's an "on the ball" kind of guy and told the nosey woman he's having his "3rd testicle removed as we have more kids than we can handle!!!" That shut her up & I'm willing to bet she never asked about anyone else's procedures ever again!
So, no, I'm not really surprised about nosey-parkers asking about jewellery specs......when someone asks me the price of a piece I'm wearing, I usually reply, "It was a gift"