So here is a fast and frugal “heuristic” to determine whom you might want to marry:

If all their close friends are also “pretty”, birds of a feather and all that, you don’t want to marry them. They are likely too worried about their image and trying to be “cool.”

If all their close friends are not “pretty,” you don’t want to marry them. They have a “Queen Bee” complex and need to be the center of attention.

However, if their friend group is more diverse on that particular dimension, they’re a much better bet.

In my unscientific survey, this is true whether the overriding trait you’re searching for is looks, wealth, education, or some other quality

. . .
Having diverse set of friends leads to out-of-the-box thinking and an ability to branch out of one’s comfort zone.

The “Pretty Girl” Paradox, by Auren Hoffman