Condoms and cockrings

The girlfriend is between birthcontrol prescription this month. Have to go back to condoms. Cockring under or over condom?

Have her get a diaphragm. So easy and you could insert it for her.

I would say the cock ring goes over. That would make the most sense to me.

I've never tried both at the same time. But I would think that it would be very difficult to put the ring on (depending on what kind it is) while you already have the condom on. And putting the ring on might even break or tear the condom. I would put the ring on first, slipping it all the way back behind your balls, then slip the condom on.