look up any word, like cleveland steamer:
 
1.
a group of annoying, obnoxious, bitchy sluts that go to chichester and think everyone loves them but really nobody likes them.
"WE'RE THE DIAMOND GIRLS!"
"Is that a joke?"
by th@ m@n September 23, 2009
 
2.
The girl a guy wants to marry/ propose marriage to.
"You're my diamond girl, you're the one i put the rock on."
by Bergy Berg March 11, 2008