The diamond shape you can see in between a girls legs from behind (usually girls with hot bodies). Best accentuated by sunshine through a summer dress.
A real, top lad. A gentlemen who will go out of his way to ensure everyone and everything around him experiences the best possible life. Common in London and other heavy-cockney areas such as Essex.
1 - an escort starting at $3100 an hour, $31,000 a day (see Emperor's Club VIP, Eliot Spitzer prostitution scandal)
2 - a particularly lovely female of any sort
"That honey over there is a seven-diamond girl!" "Eliot Spitzer was paying like $5500 an hour for a seven-diamond girl."