Boyfriend’s ring

Japani

So a while ago I got my boyfriend a ring and he has been wearing it for a long while now but it has been irritating his skin to the point where it can bleed. He gave it to me saying since I have it to him, he wondered that if I can make it into a neckless. Although it’s a great idea I don’t know what type of neckless chain I would give this ring. What would be the best on a guy and with this ring?