Only ONE thing to do for him: give him your very BEST single left-over gold earrings, posts, etc....you know, the ones left over from the ones you've lost.
You might even give him a nice diamond, emerald, ruby post for his ordination date, birthday or Christmas. You can suggest color coding the post with the days of the Church year.
This might let him know, in a very subtle way, that his earring is causing you to focus on his earlobe, not on what he says of God.
good idea!!