Do gay doms adorn their necklace like a sub would wear a lock?

Wow! What a great sub (on Reddit). Gay, married male and new(ish) to the bdsm scene. Recently spent a weekend with a great couple that taught me a lot about how to be a good Dom/master to my power bottom slave sub husband. Protocols, consent, safety, etc.. basically it is as the title says. I want my husband to wear a lock and formalize the symbolism of his commitment. Is it typical for the owner to wear something that also symbolizes this to others? What would that object be? Thanks! 🐾