Seri is right when she says that a collar is like a ring, that it has as much or as little significance as you wish it to have. That is how I like to explain it when people ask about the topic. I'm sure there would be no problem had your boyfriend given you a nice ring to signify you're together - it's wonderful gesture and in no way is insulting to people who wear engagement rings or wedding bands.

In your case, my only thought would be that it is essential you both understand your particular collar's meaning for each of you. If he does look at it as a symbol of a full fledged D/s or M/s relationship, then a conversation is certainly in order.

Hope that helps! Amber