princesskelli

Corrected entry: Throughout the movie, McConaughey wears a wedding band on his ring finger. He is not married in the movie.

Correction: It should also be noted that McConaughey wasn't married at the time of filming, so he certainly wasn't wearing a wedding ring.

Bishop73

A gold band is visible on his right ring finger in the scene in the bathroom at his family's house.

That is to say a ring on the ring finger, even on the left hand, doesn't constitute a wedding ring. It's just a ring. There have been instances when married actors don't take off their wedding rings for a film (or scene) which means the ring it's possibly not a character choice, but this wasn't the case for McConaughey.

Bishop73

Correction: Not a mistake to wear a ring wherever you like - quite a few people wear a ring on the ring finger of their left hand despite not being married. No law against it.

Correction: No he doesn't. He always wears a ring on his right hand, not his left, where you would wear a wedding ring. Lots of guys wear a ring on their right hands.

princesskelli

Could be a family heirloom and have sentimental value. I wear my grandmother's ring on either ring finger, if it's not fitting on my middle! Darn knuckles... So, that's a logical possibility too.