According to US Magazine®: Fred Cuellar, president of Diamond Cutters International says you can learn alot about lady from the cut of her rock. Here is what he says:

ROUND:
"Round wearers tend to be old-fashioned, honest
and faithful. Their marriages have the hightest
success rate."
Who's got one: Madonna

EMERALD CUT:
"These wearers are leaders. They don't try to
impress others."
Who's got one: Sarah Michelle Geller

PEAR:
"These women enjoy being different. They also
tend to be prefectionists in love."
Who's got one: Jessica Simpson

PRINCESS AND RADIANT:
"Sparky and fun, like their owners. When their
marriages fail it's often because the man can't keep up."
Who's got one: Jennifer Lopez

HEART:
"Heart wearers ar the most cheated on. They live in Fantasyland."
Who's got one: Joan Collins

OVAL:
"They make great wives. They're stable, but with
a wild side."
Who's got one: Toni Braxton

MARQUISE:
"The crown jewel for divorce! The guys are usually
trying to compensate for something."
Who's got one: Posh Spice, Catherine Zeta-Jones

See, now wasn't that interesting???? ;)