I think it's InSaNe that this women said that to you!!! BAM POW!!!
Now, I think it looks SILLY if someone wears a diamond ring on their right hand that has the style of most engagement rings. (IE: .75ct solitaire with matching band.) I would NEVER make a comment about it though, as I see it as just MY personal opinion!!!
Tons of designers create gorgeous RIGHT HAND rings chuck full of the sparklies!!! Diamonds can NEVER be slutty IMO unless the man (women) your dating has one on their wedding finger and they aren't YOUR husband/wife! LOL KWIM?!
I'm curious about this too. I used to wear a diamond solitaire on my right hand when I turned 18. It was a family heirloom.