Very few parts of a wedding endure past the last dance at the reception.

The gown gets put into storage, the flowers wilt, the cake gets eaten.

The big exception are the rings, which stay as a permanent reminder of the happy couple’s commitment.

Man proposing to a woman

The engagement ring, in particular, is the one that truly stands out.

There’s a lot to take into consideration when choosing an engagement ring.

Gold, white gold, or platinum band?

Kate Upton diamond ring

And what bang out of stone?

But the round-cut diamond isn’t going anywhere anytime soon, and Kate Upton’s engagement ring illustrates why.

In other words, seeing something that looks pointy or sharp provokes an instinctive fear response.

Round diamond ring

By contrast, people are more likely to associate round shapes and objects with positive words or feelings.

And not all angular things are scary, as $100 bills prove!