Some people have asked what ring Tommy wears and in season 1 episode 5 at 48:54 he's clearly wearing a buckle ring. This is also interesting as these rings can signify love
Tommy Shelby Peaky Blinders Photo Fridge Magnet- Photo Novelty Fridge Magnet: Amazon.co.uk: Kitchen & Home
Peakyblinders | Peaky Blinders: What happened to Tommy Shelby's mother? - Peaky Blinders
Tommy's Rings: I know there was a post asking about them a week or so ago, here's a screen cap - definitely not a claddagh ring : PeakyBlinders