Venus' diamond

n., (aka diamond of Venus or diamanti veneris)

gap, usually diamond shaped, between a woman's legs at the top of the thighs and below the vagina (pussy).

Indicates well toned thighs and wide hips: attributes of a well formed and sexy female.

Bro 1: you see the new Dior fragrance ad?
Bro 2: yah, Charlize Theron's Venus' diamond is just, like, totally bangin'!
Bro 1: yah!